I have a Yamaha DVD-C750, which is a universal DVD changer. I don't think it does upscaling, but the C950 does. (if either is even still on the market.) It's a decent unit, but I'm unhappy with a few things; namely that the resume play feature is fairly iffy, the shuffle is seriously questionable, and the fastforward/rewind controls are a joke.
a) Resume play: you have to hit it at the exact correct time in order to get it to work. Too late, and the restore point is gone.
b) Shuffle-CD only (no DVD-A or SACD) and it switches disks every time-1, random song, 2, random song, 3, random song etc.
c) You have to hold down the appropriate skip chapter button in order to get ff/rewind to work. I have not found a workaround, even with a universal remote.
Since it doesn't sound like you're looking for a universal player, you're going to have better luck than I.
