The chip looks good, but stay away from the new Asus boards, as Ive heard they have power problems. Asus used to be the best, the only thing I would buy. Now they went downhill.
THe Gigabyte boards look like the best thing going now.
If you are going to spend the money, buy the new mac pro, only 2700.
Sounds High but I looked up the wholesale cost on the XEON chips they are $800 each. The case is very quiet. You can run MS XP on that directly to the CPU (no Windows on top of OSX crap)
I am working on a design to make a 100% silent box, but it is very difficult because of the price of high end power switches, and the heat dissapation issues for CPU, (the 45nm are giving me hope). Also SSD Flash Memory devices are very expensive and unreliable.