Buster D said:

Thanks for the tips, but my laptop doesn't have HDMI, so I can't get DTS-MA or LPCM 5.1 no matter what codecs I have.

My projector will of course accept 1080i, but that still results in pulldown judder. My girlfriend's 120hz Sony TV will remove judder from 60hz progressive sources, but she doesn't have an AVR or anything, just the TV speakers.

What players will output 1080p24 from 720p24? Probably won't bother getting another one (already have an Oppo, a PS3, a Panasonic 3D player, and two Blu-ray recorders), but I'm curious if this feature really works.

An Oppo 93 and above will output 1080p24 from 720p24 mkv, however it won't output DTS-HD (just the core if you are lucky). However, if you convert the mkv to Bluray structure (as BDMV folder on USB drive or burned to Bluray disc) an Oppo 93 will play it back just fine in full resolution.

You are probably going to tell me next that you have an Oppo 83.

The cheap Bluray players will often output 1080p24 from 720p24, but I can't help you with which one.

The best solution is to construct an HTPC: that is the only solution that is completely under your control and flexible enough to handle any codec thrown at it. All standalone devices are crippled in some way: the studios don't want to make it easy for you to play copies of their "copyright" material in full resolution.