What sort of budget do you have?
I would definitely look at getting a Blu-ray player - they're so cheap nowadays, it's a false economy to get a DVD player in my opinion (unless you're looking on the used market, in which case you could get an older high-end DVD player for a song if you're willing to look around).
First and foremost, I've not heard or seen any of these to say for sure on their performance. However, for a small budget,
this Pioneer looks like a good deal, and has some decent reviews on its Blu-ray, DVD upscaling and music performance. It may not be as good as some of the newer budget players, but it does have component and optical outputs, whereas most of the newer players unfortunately are missing one or t'other.
For higher budgets, I'd be looking at the likes of the Marantz, Cambridge Audio or higher end Pioneer players personally (or perhaps an Oppo?) - a trip to your local dealer will allow you to demo a few models so you can compare their relative musicality and DVD upscaling abilities.