Best upgrade, in this case: NT MaxPower 7448 Single 1.6 Ghz, 2 GB RAM, ATI Radeon 9800 Pro 128 MB, 128 GB SSD and DVD DL on Sonnet SATA card, second ATA HD Maxtor 320 GB 7200 rpm partitioned into two (Time Machine and emergency Boot), Sonnet USB 2 card, Adaptec SCSI card. Mac OS X 10.5.8. The good news: CPU Price: 177 USD, GPU price: 134 AUD both new and fully functional, with ATI driver CD (control panel Monitor). Antec EW ATX 430W Power Supply. The replacement power supply is much more simple than you say... I will explain to the parties concerned. The bad news: dropped frames in the movies (both DVD to Apple Movie Trailers ) disk permissions permanently and severely wrong. To see all the 320 GB I installed SpeedTools ATA Hi-Cap Driver for Mac. Any ideas?