projector choice
When choosing a projector, test that it works fine with the output of PC video cards (such as the ATI AIW 9800 Pro, which has component video output). Certain projectors, even though they say they support HDTV (and you'd be automatically lead to believe they'll work fine with any component video source) do not work well with outputs from PCs.
The way forward for Home Theaters is to have it hooked up to a PC, so if you're gonna be spending $$$ on a projector, you might as well make sure that it works well with something you will find yourself buying soon, a Home Theatre PC.
I unfortunately found out about this the expensive way.
Zuksh