There is a VGA adapter for the 360, so you should be able to do Hi-Def just fine. I'm gonna get a 27" Syntax Olevia LCD HDTV/Monitor, so I can plug both my computer and my 360 into it. It's like 500$ at BJ's Wholesale, and it's got either a 1600:1 or 2000:1 contrast ration, and a fast refresh rate. The only downside is the speakers on the TV and the slow remote reactions. But I have other speakers I can use.