1080p projector + PC gaming

First, let me state i have this already and wanted some opinions before i break down my office and move my PC downstairs. I know i can try it and see how it turns out - but i dont want to waste several hours to find out it sucks.

Computer specs:
CPU - i7 920 @ 3.6
MB - Asus p6t
RAM - OCZ gold 3x2gb
HD: Twin Raptor 300's in raid 0 with 750gb backup drive
PSU: thermaltake 850 tp
Vid card: GTX 285 (no OC)

Projector is Epson 1080ub
Brightness (Lumens) : 1600 ANSI
Contrast (Full On/Off) : 50000:1
HDTV: 720p, 1080i, 1080p/60, 1080p/24
Component Video: Yes
Video: Yes
Digital Input: HDMI (HDCP)
Computers: Yes
Display: Type: 0.7" 3 LCD
Native: 1920x1080 Pixels
Maximum: 1920x1080 Pixels
Aspect Ratio: 16:9 (HD)
Screen: 120inch white 16:9

I am wondering how this would look using a DVI to USB cable to the projector (6 foot distance) on a 120in screen. I currently have my ps3 hooked up to it and love it. Its perfect clarity and brightness and the color is beyond fantastic to me. I am not video guru, but i love it. I play PS3 games and watch blue rays on it all the time.

If it works and looks good, how do people deal with a keybaord and mouse without using a desk? I would have to sit in my lazy-boy or on the couch - so i can use wireless, but i would need a tray of some type.

Thanks in advance.