I was going to just pick one of the top 3 off of ProjectCentral's Editors List, and $5k is a bit out of my range. Not by much though. I see one JVC projector on that list but I don't have that much money right now being unemployed. A couple of beers and I doubt it matters very much.

My research on screens tells me the only thing you get with more money is better reflectivity. In other words, if you have a dim enough room you are fine. There are some pretty good screens out there for a few hundred bucks. For a few bills you can get a retraction motor. I have a framed photographic-paper screen I made in the garage and it is most of what an expensive screen is without the added ambient light performance. A lot of people just use the wall with good enough results.

Onkyo makes great AV equipment and I have one of their machines. It has HDMI ports and 7.1 surround sound. If 3D is worth the money, please let us know. You are an early adopter! There can't be that many titles available but maybe there will be in a few years.