If you're looking for a serious conversation piece, check out this 7-foot tall statue of Halo's Master Chief that someone has for sale over on eBay. I guess Microsoft made a very limited number of these to promote Halo 2 when it came out. Now you can own your very own.
The current bid is just over $500, but it's bound to go up before the auction closes on August 30th. The seller is located in the Atlanta area, so if you happen to live around there, you might even be able to pick it up and take it home to the wife and kids.