I'm looking for a celebratory mid-to-high-price dinner spot with my thesis advisor -- someone I've known for a while, but primarily in a professional capacity. As I'm graduating, we're at the awkward transition stage to a mentor/friend relationship, so I don't want to pick a terrible place that sends the wrong signals. I would also want to spend under $150. An enjoyable, interesting atmosphere (but not too loud, not too silent, and definitely not romantic) also seems important.
Besides all those worries about how to pick a restaurant that works for this dinner, I almost never spend that much on food and would love to get my money's worth. Any suggestions for classy, vegetarian/vegan-friendly, awesome-atmosphere restaurants that are also incredibly delicious and worth the major cash I'm about to spend?