Are you dissatisfied w/ your HD display's own upconversion? If not, I wouldn't worry too much about it on the player side.
Yeah, I can see the (mostly small) diff between my PS3's upscaling and my Samsung DLP's upscaling (w/ playback from my Denon at 480p), but most times, I haven't cared that much -- if I cared that much for certain titles, I'd just upgrade to BD anyway (unless it's not available in Blu yet). It's not like slightly better upscaling will suddenly turn a crappy DVD transfer into HD quality -- not that all DVDs are crappy of course.
Most of the quality HD displays out there now should do a decent job of upscaling, if not quite up to par w/ the best upscaling players. And depending on your exact display, it may still force some degree of its own conversion anyway due to its own native resolution requirement.
Having said all that, I'd suggest considering a PS3 instead if the quirks (along w/ other side benefits) that come w/ it doesn't bother you.

But if you really do need the multichannel analog out, then I'd probably opt for the Panny BD80 (by a hair) myself out of that batch. I just don't trust LG and Samsung enough yet for BD players although there are apparently some complaints about the Panny's lately as well.
_Man_
Edited by ManW_TheUncool - 11/29/09 at 6:15am