SOmeone here mentioned a player called Light Alloy (for video files and DVD playback). I tried it and it is really good. Very lightweight and lots of customizable, powerful features. The only problem is that it costs $30, which is a bit much considering that MPC is free and you've probably already payed for a DVD player.
As a sidenote, I think more developers should find a kind of middle ground as far as pricing of software goes. There's a lot of good freeware out there, and there are a lot of good shareware programs that usually cost $30 and above. But there isn't much in the $5-10 range, which is what would be attractive to a lot of guys like us who like cool little programs here and there, but don't want to shell out $30 a pop. That's why this site is so cool, because we get a lot of useful little programs for however much we want to donate. But you can't expect everyone to have the same philosophy as mouser (you're one of a kind, man). Anyway, that's my rant for the day.