The first one that comes to my mind, (probably a biased opinion b/c it's my old device) is the Evo4G. I don't know how much they are going for now on ebay, but perhaps you can check out the classisfied section on this forum here:
Classifieds - Android Forums
Or, if I make up my mind one of these days, I could sell you mine. Its in pristine condition, rooted and there is a rom made for it that enables it to be used as a media player only.
Anyhoo, that's my opinion