What would be better idea to get as used computer?? Powermac Dual G4 1.6Ghz (Powerlogix CPU upgrade) 1.25Gb memory, Radeon 8500 AGP Superdrive USB2.0 PCI SATA Card 40+120Gb HD Powermac Single G5 1.8Ghz 1.5Gb memory, GeForce FX5200 AGP, 160GB HD, Combo drive etc. What would be difference on speed? Main use would be graphics design/multimedia and some database etc. Money is an issue currently so can't opt for MacPro just yet..