I'd vote for Erwin. They make a mean martini, which is half price on Tuesdays, as well as certain bottles of vino. You can't beat the atmosphere--sophisticated, but not stuffy. Fresh, but not hipster. Every time I've been in the restaurant, Chef Erwin makes the rounds, which is always impressive to out-of-towners.
If your dining companions don't like the 'scene' aspect, avec might not be a good bet. The food is outstanding, but the crowds can be a bit...annoying? I personally like the seating arrangements and some of the buzz, but if you want something comfy, personal and top notch, Erwin wins.