Buster D said:

An Oppo 80, actually. But thanks anyways. I plan on building a new desktop PC eventually, so I guess I'll just make my own 1080p24 upscale. Although one made directly from Harmy's 720p24 master instead of the compressed encode would probably look better.

I feel your pain: I wasn't able to get good consistent high quality playback of most media until I purchased an Oppo 93, before that I was chasing media players and other cheaper players that always had some compromise. The Oppo 93 is not perfect, but it's the closest I have come.

The other way to get better playback results is to invest in a Bluray burner and burn as much as possible to Bluray structure: it's the one thing guaranteed to be supported properly in a Bluray player (mkv etc are bonuses that may or may not work, even the Oppo 93 has a few mkv caveats).

Bluray discs are as cheap per GB as DVD now and with less issues with layer changes, although burners are not yet quite as cheap.