You can go for the Phenom II X6 (1055T, 1075T, 1090T) + AM3 mobo + 4-8GB of RAM, a smaller Samsung Spinpoint F3/F4 for the OS, a 1TB Spinpoint F3 for storage, cheap SATA DVD-RW, a GTX 470 video card, PSU - Corsair, Seasonic, Antec (500W +) and a case.