My wife and I have been using her old 350mhz iMac at home and it seems to be getting slower and way more buggy lately. She uses it for school and it's been freezing up when doing simple things like spellchecking papers. I want to get her the new 20" iMac but heard something about how it has some "problems". What are these problems, and is Apple still shipping new ones with these problems? Should I go for it now or wait a while? Thanks for any advice.