I have to agree wholeheartedly with everything Dragonized said about foreigners in China. After the experience I had at 2 different Uni's, my best mate was a Chinese student and a non-teacher fellow countryman. The other teachers (with one exception) were all very difficult to get along with and had various issues that affected their personalities. (But don't we all right? it's called being human).
My experience underlines the 'diverse nature' of foreigners in China I suspect. Being relatively quiet, friendly and easy going and a non-drinker, didn't make it any easier to find good foreign friends. Location played a big part too because 2nd and 3rd tier cities have so few foreign teachers to make friends with to choose from in the first place.
Having said all that (not to mention the crap salary) I'm nutty enough to do it all over again. There was something surreal about the whole experience. Action adventure and excitement spring to mind! Just watch out for the low moods however, 'cos they WILL hit you.