I may show my ignorance here...
But doesn't every DVD stand-alone play NTSC and PAL?
Coming from Europe I know of no player that is PAL-only. Shouldn't those extensive lists at http://www.dvdrhelp.com/dvdplayers reflect this possible incompatibility if there was one?
You're sure you're not talking about Region Codes that prevent a RC2 (from Europe) to play in a US player which only accepts RC1?
If that's the case, DVDDecrypter strips all RCEs out...
Edited to add:
After reading a few FAQs it really seems like there are actually NTSC-only players in the US... Tough luck, become European
Maybe the real problem doesn't lie in the player, but the TV set. Since the players don't convert PAL <-> NTSC you still need a multiformat TV to actually watch the player's output.
Again no problem AFAIK over here in Europe if your TV isn't older than ~5 years.