Hi, I am currently running a PowerMac G4 450 AGP OS 9.2.2 with 128MG RAM. I want to upgrade to OS X, and I know that I'll need to increase RAM to do that. I also want to add another hard drive and possibly upgrade the CPU. I'm not sure if I'm better off buying a new Mac or upgrading what I have now. If I were to buy new it would probably be an iMac when they are next updated. Or am I better off increasing RAM and putting in a new hard drive? Also, how difficult is it to upgrade the CPU on this? Or how high can I go within a reasonable limit? (I've seen posts saying that you can upgrade to 1.2G, but for $850 that seems ridiculous, as I'd still have to upgrade RAM, add the hard drive and buy OS X, I might as well just buy the low end G5 at that point.) Thanks.