We'll be in DC early April, and are looking for a great restaurant for two couples (friends and business associates). We've been to both of Michel Richard's places and had great experiences at both, though obviously very different atmospheres. I've been reading about a few places I'd love some input on, plus I'd appreciate Chowhounds' other ideas for places with great food and a great wine list. Places on the current short list: Corduroy, The Oval Room, and CityZen. It's on an expense account, so $ isn't the issue; food, wine and atmosphere are. Thanks!