Boulder's airport is really small and only has a glider school and the FBO if you want training as far as i know.
I used to fly out of Journey's at KBJC and they are very professional, great staff, just moved into a new building after acquiring and merging with another business, and KBJC is busy but not too busy for a new student. They also have Diamonds, as well as choices in cessna's and whatnot