St. Louis Dinner Saturday Night
Busch's Grove is fancy, not trendy.
Red Moon is trendy, but hard to find. Decent Asian-fusion food if you're into that.
Eleven Eleven Mississippi in Lafayette Square is good. The Dubliner has some food, is on Washington (uber-trendy), and doubles as a cool bar. Same with the Scottish Arms. Atomic Cowboy in The Grove is trendy and they're probably opening their outdoor area soon, but the food and service are only so-so.