Currently have G5 1.8 GHz with 7 GB Ram, 2-150 GB internal HD's, 1-TB external HD for Time Machine, new Pioneer DVD-RW DVR-116D and ATI Radeon X800XT 256 MB VRAM graphic card. I would buy the new $599 Mini (after Snow Leopard is available) and upgrade it myself with 4 GB Ram, and the 320GB Scorpio Black internal HD (8,200 rpm with 16 MB cache. I don't have a problem with getting into the computer and doing the upgrades myself. I have the alum. extended keyboard and two 20" mac cinema displays (the older plastic ones), firewire apple camera mounted on top of one of the displays.. all of which I would continue to use with the new Mini. I mostly use Safari, Mail, iChat, iPhoto, iCal, iTunes, Quicken 2007, Microsoft Office 2008 and a CAD program called Archicad. Knowing these facts.... would I be happy? Would YOU be happy? Thanks for your input!