Necrobumping the hell out of this thread. #dealwithit
I recently picked up a nice projector, a Hitachi CP-SX5500. I've been able to use it for everything from 240p* to 720P. *(signals under 480P I have to transcode from scart/RGB to component, the RGB input doesn't like 15khz unfortunately).
I've been playing a PS2 on 480P RGB since the projector supports RGsB (sync on green). It's fucking glorious. It also has a composite input that lets me get through hdloader, then I switch it to RGB input once I switch the game into progressive mode. I have it at about a 72" diagonal right now, and I couldn't be happier.
Honestly as professional grade CRTs are drying up and have been for some time, I can only imagine projectors perhaps being "a thing" over the next few years. I paid $100 for mine, and it was a $8000 or $9000 retail piece of equipment back in the day.
I've also managed to use a supergun on this thing, and that looks pretty good too. The only hitch is (as noted above) I have to transcode to component. I have a nice key digital RGB -> Component transcoder so the quality is still excellent. The dreamcast on VGA is also fuckin' sweet. These pics don't do it justice... but pics nonetheless: