Well, ATA is geared toward racers... be prepared for an attitude. I bought my Kuota at the ATA in Concord. They treat me well, but let's just say I had to be very firm and prepared with research that *they* should have done when they sold me a frame that was just too big. They did right by me in the end, though.
If you go to the ATA in Porter Sq., they do appear to have quite a few commuter type bikes there, probably to meet the needs of the people who actually ride to get places.