Hey guys! Im right now making an offer on a G4 sawtooth unit. Im a PC guy but I want to try a Mac out. At this moment I cant afford to buy a spankin' new one, but I sure would love to upgrade a oldie like the G4. In regards of OS what version can I aspire to. Also I need some tips on the CPU, HDD and Video card. I know that ram is limited to 2Gb. But my main question is.....is it worth it? BTW The G4 on the list is a 400 mhz with 512kb, HDD of 20 and a Video card of 128kb Thx.