Unless you're locked in on Athlon, here are a couple over at Newegg you might want to consider:
Quad Core (less essential than often believed), twice the RAM and I much prefer the 64bit OS which means you can add more RAM
· Recommended Usage: Gaming
· Processor: Intel Core 2 Quad Q6600(2.4GHz)
· Processor Main Features: 64 bit Quad-Core Processor
· Cache Per Processor: 2 x 4MB L2 Cache
· Memory: 4GB (2x2GB) DDR2 800
· Hard Drive: 500GB SATA-II 3.0Gb/s 7200RPM HDD
· Optical Drive 1: 20X DVD±R/±RW Dual Layer Drive
· Graphics: NVIDIA GeForce 9400GT 512MB PCI Express Video Card
· Model #: Gamer Infinity 4411
· Item #: N82E16883229066
· Return Policy: Desktop PC, Notebook, and Tablet PC Return Policy
$ 649.99
· Recommended Usage: Gaming
· Processor: Intel Core 2 Duo E8400(3.0GHz)
· Processor Main Features: 64 bit Dual Core Processor
· Cache Per Processor: 6MB L2 Cache
· Memory: 4GB (2x2GB) DDR2 800
· Hard Drive: 320GB SATA-II 3.0Gb/s 7200RPM
· Optical Drive 1: 20X DVD±R/±RW Dual Layer Drive
· Graphics: NVIDIA GeForce 9500 GT 512MB PCI Express Video Card
· Model #: Gamer Infinity 6311
· Item #: N82E16883229062
· Return Policy: Desktop PC, Notebook, and Tablet PC Return Policy
$ 649.99