Unless you need to have the highest FPS possible, the FX-60 will be fine for a while. It is a good CPU that can hold its own. IMO, I want to spend as little on upgrades as possible at any given time. The final choice is yours though. Actually, looking at newegg.com, you could do a lot better for less. Buy an AM2 X2 6000+ for $239 and then buy an AM2 mobo. You will end up saving money this way (only one CPU upgrade and you get a newer socket which is supposed to work with K10). The 6000+ performs better than the FX-60 and is 60 bucks less. As far as the 64-bit thing: The 64-bit support means that it can run XP or Vista 64-bit. It does not mean that it has to run in 64-bit.