I am about to take the plunge and buy my first Mac. I am looking at the 20" iMac G4 and will be using it primarily as a work tool (word processing, data base etc). Should I buy now or wait in the event that new more powerful versions are on the way? I currently run a PC with Pentium 4 2.4 chip and 512 memory and am sick of Windows and viruses. Advise appreciated.