Just thought to post a summation of our search.
After much discussion of exactly what consistututed a great Chicago steakhouse, the wife and I determined the following criteria:
It must be a place that focuses on steak. If it has "Steak" or "Steakhouse" in the name, that's a promising start.
It must be a Chicago restaurant
It must not be a chain restaurant.
So we narrowed our rather voluminous list to a couple of well-qualified selections, and then stressed for several days whether we made the correct choice:
Keefer's came well recommended by many places on this board, as well as a few other sources we polled. No one ever faulted the quality of the meat, just whether it was truly a Chicago steakhouse. It's in Chicago, there are no other Keefer's, and it primarily serves steak.
Erie Cafe likewise received large volumes of positive review, and most certainly falls into the category of Chicago steakhouse, as it is actually an offshoot of the venerable Gene & Georgetti's, a once pround champion of Chicago steakhouses, but which was panned almost universally as a place where you have to know the owners to get even decent service. Erie Cafe, however, has had no drop off in service, and has had some phenomenal reviews of it steaks and the service.
Tavern On Rush had a couple of positive reviews, and no negatives, and otherwise fits the criteria we chose, so it's on this list, but would likely fall behind someother places, if for instance the moratorium on chain restaurants or must be a steakhouse was lifted.
So we eventually choose Keefer's, based on a good friend's rather insistent demand that we call his friend Glen at Keefer's and we would have a great time. Glen turns out to be Glen Keefer, so from this point any scientific exploration of the subject is moot, as we are now receiving the friend of the owner service, not the "just made a reservation on Thursday for dinner on Friday" type of service. In the interest of full disclosure, neither Glen nor his brother Richard were present, or if they were, there presence was never made known to us.
Drinks at the bar were comped. Sweet. It's good to know people, I guess
Bar has a couple of TVs running the NCAA conference tournament games, which is cool, so we can keep up with who's beating who, and talk some smack with the Big-10 fans at the bar. SEC rules, baby... the Vols rule all. Always fun.
Interior is styled in what I like to think of as contemporary la-la... very modern and clean lined, with a large curved bar area. My wife is in hospitality design, and she loved the style, but thinks it a little sterile for a steakhouse (or even a bistro). I am not inclined to care much about style, my concerns in terms of restaurant design have more to do with acoustical attenuation and lighting. If it's too loud or too bright/dark, then I will comment. The noise level was very respectable for a bar area on a Friday night. Good acoustic dampening design in a otherwise irrelevant dropped ceiling. Lighting was perfect. Each booth seemed like a private room, until the next table laughed loudly, or an early St. Paddy's reveler staggered too close...
Our server was punctual, and efficient. Conversant with the entire menu, but not one to stand and chat at the table for 10 minutes. Perfect. I respect and require your expertise, but I am here with a date, and their company is obviously preferable to most everyone else, or someone else would be in the wife's place...

She talked a lot about the seafood and fish menu options, as well as the seafood specials for the evening. When we asked why a steak place was pushing all the seafood ("How old
is this fish?"), she replied that it was a Friday during Lent. Duh. Now appropriate guilt-ridden (I am a recovering Catholic, it doesn't take a lot to get guilt-ridden) we talked about our selections.
Keefer's is bistro-style eats, which almost would have disqualified it, but the focus is obviously on the beef, with a selection of great cuts to choose from. We had a couple of appetizers: grilled calimari and the shrimp gumbo. The calimari was near perfectly cooked: done, but not over done to the point of chewiness, just enough texture to prove that they had cooked it through. The gumbo was delicious, and not overly spicy, which is a common complaint I have about gumbo made by people who are not from the south. Most gumbo made at a lot of restaurants is spiced with either too much black pepper or too much Tabasco. Neither one is particularly Cajun, but everyone thinks Cajun means tear the stomach walls and burn the colon. Keefer's was near perfect: seasoned well, but not burning up with spicy heat.
The steaks (she: small filet mignon/ me: porterhouse) came out perfectly to temperature (medium rare for both) and were not overly seasoned, just salt and pepper and Maitre'D butter. The cuts were perfect, and the portions were appropriately excessive for a dinner of that price. These were both fine examples of what a steak should be: tender and juicy, but with enough bite to keep them from running around in a pool on the plate. I have had only two steaks that rivaled these: one was a ribeye from Ruth's Chris', that was perfectly medium rare, and the butter had not browned on the plate, so it didn't stink like burnt butter, the other was a ribeye I slowly cooked over dried pine and oak somewhere in the foothills of the Smoky mountains that I had packed in my backpack. There is no better tenderizer than salt, pepper, red wine and 6 hours of endless agitation as you climb miles into the moutains. Or maybe I was just starving...
The sides: Al a carte sides, and with soup and app, were not interested in a bunch of sides: We split the Hogan's peas, and the potato croquettes. The peas were delicious, but I found the leak cream used in the peas too rich, especially considering it was a side for a steak. I would have appreciated something more zingy, less creamy. The potato croquettes were somewhat baffling. Softer than a tater tot, and more delicately seasoned, but eerily similar to the fast food staple in most respects. Also served with a completely unnecessary splodge of melted asiago cheese in the bottom of the dish. Way too creamy and rich for a steakhouse side. Needed more onion/garlic, less creamy. I don't understand why restaurants don't approach side dishes like wine and food pairing... If the main course is rich and fatty, give something zippy and acidic as counterpoint, not more richness and fat.
We chose a 2001 Angludet from the Margaux appelation from the wine list, and as always, I was blown away by the quality of wines from this vintage. While most of the "professional" critics downplayed the vintage, it was classic Bordeaux, and these wines are just coming to maturity. Crisp acidity, with a little more earthy depth than most Cabernet-based wines, and silky tannins on the finish. A beautiful counterpoint to the richness and unctuousness of the fare. Held up perfectly to the load of beef on our plates, and came out smiling.
All in all, it was one of the most enjoyable evenings of my life, as everything was near perfect. Timing was great, free drinks always good, service was A+, all food was well done, with one caveat being the sides (and that's a personal thing, I know), and I was not immediately floored by the check. It was about what I expected for a dinner of that quality. Overall, one of the best steaks I have ever had.
Erie Cafe will be next, but don't know when I might be in the mood for another steak out at a restaurant, as I pulled the Weber out of the garage last night... In general I prefer to cook my own