If you're planning to build yourself a system anytime soon, Socket 939 is, imo, the way to go. The XYZ gang lays some groundwork to make your decision that much easier.

"In this guide we are going to put together three systems, each at a different price level. These are not systems we have built up so there will be no testing or anything like that, but it will give readers a good idea of current prices and some new products."