Take a look at:
http://www.chinafocustravel.com/
I'm pretty sure this is the company friends of mine in Concord just did a tour with from SFO, and it was recommended by friends of theirs that also used them. They were particularly happy with the quality of hotels (4-5* from what they described to me). I'll try to find out which tour they took and update here.
edited to add: They did the 12 day tour, which may be the same as the 11 day tour in 2008. It was with China Focus.