Upgrade your Bios to the latest version always is best. Stick with a processor of the same FSB. You can get a large increase, and still stay with the same Bus Speed. Your original idea for the 2.0 Core2Duo is what I run in mine. That with 4Gb memory (careful on this upgrade....the board is particular which memory works). Also I used a 320Gb 7200rpm HD. Between the 3 upgrades, it's proven to be very stable and quick.
12/25/11 at 5:29pm