Projector and Screen recommendations

Picked up an used Optoma 106" gray screen yesterday, it's listed as 1.8 gain. without tweaking the picture, I thought the image was a bit too bright for my taste and I already had the projector on low lamp mode and 15' from the screen. but it definitely adds some punch to the contrast and dynamic.

I think I will end up with 2.1 instead of 5.1/7.1 channels just because it's so much easier. I am a tube guy, can't afford to run my expensive tube pre & power to watch movies and that's why I got interested in a better receiver. will go check out some Pioneer Elite and Sony ES over the weekend, but I am sure they are no match to Einstein/Benchmark DAC/BAT 150SE.

Most of the "high-def gray" screen I can find on the web are 0.8 gain. I also have a Mit 4900 and run it in low lamp mode 99% of the time, wondering if 0.8 gain is sufficient in a dark but not completely light control room?

where can one find a gray screen with 1.0 gain? I am torn between pull down and fixed frame right now... also torn between adding a solid state amp to do 2.1 or buy a better receiver for 5.1/7.1 in the future. I don't need surround sound, but kids love them. a decent solid state amp will easily cost more than a good receiver, but even a good receiver like Pioneer Elite can't drive my Sonus Faber Amati well.

My 2-ch system is pretty much done for now:

VPI SSM Ref w/ rim drive
Einstein phono
Einstein pre or SF Line 3SE+
Computer audio + Benchmark DAC USB
Sony SCD 777ES for SACD
BAT 150SE
SF Amati Homage or Guarneri Memento
JL F113

If I do 2.1 for movie, will go like HD DVD -> Benchmark -> some SS amp -> Amati/F113. With this setup, subwoofer output will have to be cranked up each time I watch movie.

I am also toying with the idea of HD DVD -> Pioneer VSX-92 -> Amati/F113. With this setup, I can get LFE and maybe add center/surround speakers in the future.

I know I don't care too much about sound quality when I watch movies, but not sure if using a newer receiver with HD audio decoding capability will make watching movies more fun. I had a cheap surround sound system setup in the past, it sure was more fun than 2-ch especially with the subwoofer running LFE.