Lenovo Idea Centre K230 - 53594KU Intel Core 2 Quad 2.50GHz, 8GB RAM, 640GB for $749 - $150 off coupon code USP53594K [Exp 11/23] = $599 with free shipping.
Intel Core 2 Quad Q8300 Processor 2.50GHz, 8GB PC2-5300 DDR2640GB HD, NVIDIA GeForce 9300GE, Windows Vista Home Premium 64