I know that we (including me) are generally against tours and tour guides, unless complex logistics or odd locations are chosen (and even then we try), in which case some of us plug Wild China.
I just heard about this other company, Real China and some of the stuff offered looks interesting, but it would be great to get the opinions of those better informed than I about it - if anyone has heard anything or has any experience.
Cheers
http://www.realchinallc.com/