Look for a 'C3' stepping PhII 965BE or a six-core 'Thuban' with unlocked CPU multiplier (like the 1100T). Your best bet might be eBay.
Good luck!
edit: Most modern AM3 processors will be much faster than your current chip! (I'm assuming you know this)
Wisecracker: Thanks much for your reply and thanks for your assumption re: AM3 processors although your assumption could not be further from the truth. I am now somewhat more enlightened in that regard but still glassy-eyed. Are you saying that I'm not limited to AM2 processors as my manual says? That would be good since it would provide more options for an upgrade, but I'm still in the dark. When you say "Look for a 'C3' stepping PhII 965BE or a six-core 'Thuban' with unlocked CPU multiplier (like the 1100T).", it's very much akin to telling a monkey to simply turn the key. The look you'd get from me would be very similar. Regardless, I'll do some googling for a six-core Thuban.
Hopefully I wo't end up buying a monkey....
Thanks again.
-Saul Good-
(edit: Most modern AM3 processors will be much faster than your current chip! (I'm assuming you know this))