I am looking to buy a used older Mac for a family member, that will mainly used the Mac for surfing the web and checking emails. No huge files or programs or gaming. I was thinking of either an G4 older iMac or maybe a G3 iBook from this site www.macofalltrades.com Anything to look out for when buying a used Mac? Also is a G4 better than a G3 or really for what this person will be doing it won't matter? Suggestions? Ideas??