Thanks for the suggestion, but with the stuff I've selected added to it, it comes out to be more expensive than the system I built on NewEgg. I haven't ordered anything yet because people keep telling me to go for Core2Duo.
As it happens, while the CPU itself is more expensive than that 6400+, the motherboard is cheaper, so it balances out.
The ones I went with are
http://www.newegg.com/Product/Produc...82E16813128059
and
http://www.newegg.com/Product/Produc...82E16819115029
The E6750 also beats 6400+ in various benchmarks from what I can see. However, I'm doing more research and comparing components.