|I'd normally recommend the X58/Core i7 950 with an overclocked GTX 460 graphics card, but because Intel's Sandy Bridge and AMD's Bulldozer processors are right around the corner, WAIT a few months. I know, using that P4 must be painful, but you can do it. :)|
The Sandy Bridge i7s will be much faster than the current Nehalem chips, and the Bulldozers should bulldoze the Phenom II X6.
Socket 939 | Dual-core Opteron 185 @ 3.2GHz | 4GB | 1.0TB | Win7 x64
GeForce GTX 460 1GB | X-Fi Ti Pro | A8N32-SLI Deluxe | Antec P182