i've converted my PC to HT in a big way. first of all, why settle for a 32" when for the same amount of money you can get a 100" projector?
it's up to you, same price, equal quality (if not in projectors favor) 32" versus 100.
don't be stupid, do the right thing.
and dude, all that smack talk on wireless is TOTAL bunk.
in 3.5 years i've had the same logitech cordless elite kb, an mx700 mouse, and currently a G7. 0 issues except batteries going dead. been using them from across the room, which has a monitor, projector, xbox, pc, receiver, home cordless phone, 2 cell phones, and 1000w 7.1 system. so don't even try to say anything about interference.
there is NO reason to stay wired given your situation. they even have a keyboard out there with a cover so you can slide in between your couch cusions. trick.
ps: games look SWEET. no you don't miss much with the resolution, and if you do, crank those AA levels. that helps way more anyhow.