I'd pick China. It's changing so fast that you'll want to see it before "old China" is completely gone. One week isn't an awful lot of time -- we just spent 10 days in Xi'an (there's a lot more to see than just the Terracotta Warriors). Xi'an is a quick and easy 90 minute flight from Beijing. I'm not quite sure what Jenbel meant about China being bureaucratic to get to -- you'll need a visa, but otherwise you'll have no contact with the government whatsoever during your visit, unless you ask a policeman for directions (they're very helpful).