If you enjoyed El Ideas (one of my favorite places) good chance you will like Schwa. Similar vibe, but Schwa is less refined and the other difference is an emphasis on marrying sweet & savory on most courses. Only concern with Schwa is their propensity to sometimes cancel on very short notice - a bit of a gamble to dine there for a special occasion, but can truly be a fantastic, memorable top notch dining experience.
One place you did not mention if Elizabeth; this is another of my favorite venues in Chicago. Lengthy tasting menu, open kitchen, beautifully - artistically plated food that is mostly delicious. The cuisine is hyperseasonal and Chef Regan plays a prominent role in procuring much of the food herself via foraging, gardening and occasionally hunting and fishing. Very creative, unique, interesting cuisine and a very enjoyable, relaxed dining experience.
Moto is another venue that is firing on all cylinders. They have improved immensely over the past couple years and are really a different restaurant since Chef Farina became the executive chef. Still some whimsy and beautifully plated food, but the emphasis is now more on making amazing tasting food than on having a "wow" factor with the presentation. Chef Crenshaw really elevated the desserts at Moto since she took over as the pastry chef.
Goosefoot would be another great option for a casual fine dining tasting menu, but reservations can be tough. Chef Nugent makes perhaps the best tasting food IMHO. Senza would be another fantastic restaurant for fine dining in a relaxed, casual setting; very warm service and consistently outstanding food.
Another favorite of mine would be Boka. Unlike Elizabeth, Schwa, Moto, Senza and Goosefoot it is a la carte and definitely a more traditional restaurant, but a beautiful space, extremely friendly staff and some of the best tasting food around. Chef Wolen is really doing remarkable things at Boka.
If you enjoy Japanese cuisine, Juno is supposed to be opening again in early September (they have been closed for several months because of a fire); they were really doing some special things there before the fire and should immediately return to being amazing. Embeya would be my other choice for Asian cuisine.
Girl & the Goat serves the full menu in the bar/lounge area (which IMHO is just as nice as the dining room), so even if you do not score a reservation you can arrive early and likely not have too much of wait to score seats in the bar/lounge area. Definitely worth a meal here; one of the better values in upscale cuisine in Chicago.
While I am a bit down on Next, if you really want to dine there I would not rule it out. Prices have skyrocketed to the extent that supply now far exceeds demand. The tickets for Trio should be released soon. If you do not mind the splurge (it will be Alinea like pricing) with a little vigilance you should be able to easily score tickets for September. As there are fewer seatings with Trio than the past two menus tickets will not be as easy as with Steakhouse and Modern Chinese (where most nights all tables did not sell out), but certainly will be feasible to score tickets.
Twitter: @Goof_2