I'm going to be visiting Boston soon and am looking to go out for sushi with friends. We're willing to spend for great sushi, but a slick/upscale environment is just as important for this gathering. I've been reading a lot of the (great) sushi threads here, but not knowing the Boston area restaurants, I'm having trouble getting a sense of which ones are also truly great sit down environments vs places that turn out amazing sushi but that are holes in the wall inappropriate for such a rare gathering of friends from lots of places. For this gathering, we'll want a place that takes reservations too...
Any suggestions? Thanks!