As a Buffalo resident and frequent restaurant diner in the city, I would have to say that capturing a market that hasn't been captured yet is tough. As far as strictly vegetarian places, I'm not sure that we have a truly vegetarian place here - and there are lots of vegetarians who live in the city. Many restaurants offer vegetarian options, but none of them, I believe (and please correct me if I'm wrong because I am NOT a vegetarian), are strictly vegetarian or vegan.
You're right...we've got plenty of coffee shops, and the Chocolate Bar is an amazing dessert bar/martini bar...
I think if you do an informal poll - utilizing the many web forums (BRO or wnymedia.net), you could find what part of the market hasn't been saturated as of yet...I'd be happy to help...you can reach me at
amy@revitalizebuffalo.org...and of course, good luck and thanks in advance for opening a new business in the city!