You can get an Athlon 64 X2 3800+ from newegg for only $35.99. http://www.newegg.com/Product/Produc...20-%20Desktops It's what I used in my parents' computer, and it works just fine. The whole thing (including 2 gigs ram) from an old 2.5GHz Celeron only cost $100, and was, in my opinion, well worth it. I did use the existing DVD drive, and a better hard drive from a computer I got out of the trash, though. The [Cooler Master] case (and its crappy power supply) was also free with a mail in rebate and a combo deal with my motherboard.