Harmy said:
If you're getting a new player, you really should get bluray - the prices are now pretty much the same as DVD and even DVDs will likely look much better played through a BD player.
And get one of these newfangled ones that the kids say play MKVs on a usb drive.
As for DVD on a blu-ray player, make sure to look up reviews online pertaining to their performance. Some do very well, I believe others are crap with interlaced sources, etc.