It's not very powerful but the Pioneer doesn't look too bad. I'd be leery of the other one from the auction site ("The owner assures us it works" doesn't inspire much confidence!
). Otherwise I know a guy selling a couple of Panasonic rec's at AudioCircle, the ones with the digital amps that were so in vogue a couple years ago. Seems like he's asking $125 each, and they're well worth the money.
I'd say getting one off eBay is fine so long as you watch the sellers feedback carefully. I've had pretty good luck with eBay and Audiogon.