Lenovo IdeaCentre K230, Core 2 Quad 2.5GHz / 8GB / 640GB / Blu-ray for $599.00 shipped after using coupon code USP53594K to take $150 off.  Make sure there is no extra space before and after the coupon for it to work.  Here is a screenshot for your reference.  This loaded desktop PC comes with an Intel Core 2 Quad quad-core 2.5GHz CPU, 8GB RAM, 640GB drive, Blu-ray reader / DVD burner, GeForce 9300GE graphics, Windows Vista 64-bit, and more.  It is also eligible for Free Windows 7 Upgrade.