Hmm, makes perfect sense - so what I really need is a cheap, reliable DVD player that won't even deinterlace but will output 480i over component, or even better HDMI. Do they exist or will they all want to deinterlace to 480p, meaning I can only scale but not have my processor/projector do both, which I'd of course prefer so that it can both deinterlace (and hopefully do proper 3:2 pulldown etc.) and scale (which of course needs to be done after deinterlacing).
Hmm, maybe my old Sony DVP-S7000 (or was it an S7700, now I can't remember) would be exactly what I need - I don't think they were progressive scan back then, and it had component output, as well as a great remote (useful to program the Harmony if it doesn't have t) and a killer transport.
I'll probably do a JVC RS20, fed from a DVDO Edge, more so for video switching, plus upscaling of crappy inputs like SD DirecTV, and ability to string a single HDMI cable to the ceiling mounted projector, than because I have any problems with the processing in the RS20.