Ended up buying one called "MaigeTV" from here:
http://item.taobao.com/item.htm?spm=...id=44403520448
Showed up the next day, has 471 live channels (most in HD and a nice mix of Chinese/US/Europe/Korea/Japan), and pretty much every movie and TV show ever made anywhere in the world. Found a bunch of stuff that's still in theaters in the US yet is HD-quality. Video quality is quite good, some of the audio seems off by maybe a tenth of a second, but it's usually perfect. Hardcoded Chinese subs on all the on-demand stuff.
There's also an iPad/iPhone app that works as either a remote or lets you stream any of the channels/content as long as you're on the same network as the box. (Also, this isn't from the app store... they somehow use a QR code to install outside the app store even though my phone isn't jailbroken... I would love to know how).
Had a minor problem getting it set up but their QQ support girl got it sorted out quickly.
Anyway, the whole thing is definitely sketchy as hell, but it works as advertised and is IMO well worth the money.