I read some reviews about your recommendations and here's what I think
I might not be a 4-star restaurant person, unless that rating could be acheived with food alone. However I think the restaurant is supposed to be fancier than just awesome food for that professional rating.
I will talk down "jackets required" because I'd rather support "more modern" restaurants that can trust people to dress up and aren't stuffy about it all being so fancy.
On to the places mentioned:
Moto
Sounds interesting, read about the LTH dinner there. ALL the Check Please patrons that week loved it. It is fancy, I sure wouldn't mind a 10+ course price fixed meal but of course want to pay for the food, and as such an Alton Brown fan, I don't mind paying for innovatiive cooking ways, so long as they really work to make the food better. I like the business casual dress code mentioned on Open Table. Hope it's worth the extra money compared to the "not that expensive" places.
Alinea
Sounds too gimmicky from Phil Vettel's review, serving food on pillows filled with lavender scented air. Menu sure is adventurous. Jackets preferred for men, no jeans. Well, with considering Moto at the same time, I'd go for Moto over this place. They all have vague menus anyway....
Avenues
Vettel's review: "foie-lipops," chilled foie-gras-torchon lollipops that have been crusted with Pop Rocks candy - You have GOT to be kidding. I've always hated pop rocks, please don't ruin my fois gras!! I told my husband about this, he shuddered and I bet he'd never walk through the door. Also jacket required. Just doesn't sound our style.
Custom House
Geez, the metromix people loved this place (and you can never quite figure what kind of people they might be). Doesn't sound that expensive, but can't see much of a menu (no real web site yet). Do they really have a roasted quail appetizer? Is it a good one? I loved the one at Crofton on Well, and in the past at Eclectic, but hate the way Le Titi de Paris always is serving them stuffed instead of nicely roasted. Do they really have veal cheeks? Yum! Some reviewer said it was more expensive than Spring and Green Zebra.... I don't know if this is "the fancy expensive food" place for this post, but I sure think I'd like to go there.
Le Francais
Everest
Les Nomades
Ambria
Tru
These places are all mostly jacket required/preferred - my husband just hates that. The only inspiring menu was Tru - but I think I might find stuff that was interesting at The Custom House perhaps. Tru was that place that disgusted my husband when he saw them on TV with the fish bowl dishes and the caviar staircase. You just know you're paying for that too, and it's not worth it to us.
NOW, all these restaurants seem in the same price range as those I originally listed:
Blackbird
I've always forgotten about this place when we're going somewhere and never got around to it, but it seems price-wise right in line with the three places I mentioned. Still, would like to check it out someday.
North Pond
Also in that "not super high" price range. Looks good, but has anyone gone with "fear of fine dining" people? My father is like that, he can get angry at a restaurant if too many dishes have ingredients he doesn't know (and he won't educate himself there), and particularly if all the fishes are ones he doesn't recognize. But looking at the menu I think I could take my Dad there so long as the salads didn't scare him away. So far we can take Dad to Keefer's (twice, he picked it the second time), Harrey Carey's and things that just aren't that fancy at all, like Shaw's Crab House.
Spring
Couldn't see prices on their web site, Metromix doesn't make them sound very expensive. Sounds like a decent restaurant, but once again not more special. I think I like their sommelier, they had two Sancerre's on the list!
Green Zebra
Menu is quite different and interesting. Phil Vettel says you should order three dishes per person for a satisfying meal. How I wouldn't be hard pressed to order 5 courses before dessert, and no meat - and I'm definitely a meat eater, but enjoy the occasional vegetarian meal particularly if dairy and eggs are included in it (as they are here). Still not super expensive, perhaps a little pricey for veggies, but it sounds creative enough to be worth it. I would like to go here some day.
OK, plenty of good sounding food and innovation and such at the less expensive, presumably three star restaurants. I do like that kind of restaurant.
But might be time for an adventure to Moto, or some other innovative place that isn't stuffy.....
Nancy