A 2008 iMac with these specs just fell into my possession, I don't really have a use for it at the moment as I have a MacMini in my rack doing server duty. But I'd still like to play with it a bit. It looks like upgrading the RAM and HDD are pretty straightforward. Can I upgrade the CPU? If so, what should I be looking for? It looks like the optical drive is PATA so I can't us that bay for a SSD, correct? Any other suggestions?