I did my Private and CFI w/ McCair (the rest of my ratings at school) and was very impressed with their operation. It isn't cheapest you can get at BJC but close to Boulder, and being a Cessna Pilot Center, the training is well structured and you're flying nice new 172s. I think I also saw they have a LSA that might make some portions of your training cheaper. The best part I liked was that they actually get to know you, all the way from the people behind the counter to the owners. A good personal, safe feel.