I have an 84" front projection system (720p) and gaming on it rocks.

What most people do not get is that big doesnot have to equal expensive.The projector (Epson Powerlite 400) and DIY screen cost me $1000 total. What you do need with a projector is good light control or the screen will be washed out.

If anyone is interested in learning about DIY screens or projectors check out avsforum . com's projector forums.