I've purchased two bikes from the friendly folk down at Willy St. Bikes. One was a junk mountain bike that I beat into the ground and the other was fantastic Bianchi that I plan on using as secondary transportation with gas being so pricey. Both times I've had excellent service by staff who know their stuff and are sincerely excited about bikes.
Not sure about their service department (I've always used Machinery Row & Budget) but Willy St. Bikes has a great selection of harder to find bikes (I think they were the only dealer in town with the Milano) plus all the stand-bys.