Just build your own desktop. It's easy, cheaper, and it will turn out much better. I built my computer back in Feb 09, upgraded nothing (save for putting Win7 on it), and it still works like a charm (AMD Athlon X2 7750 2.7ghz @ 3.03ghz, 4GB RAM, ATi Radeon HD 4550 graphics card).
Want DP delivered to your inbox daily? Subscribe here: