ok im a college student and i have a desktop that i can run anything on but i am wanting an mac laptop for school. now it is only really going to be used for word processing, internet maybe basic things like i movie garage band or something. now ebay has hudreds have older mac's from 500mgz to 1ghz for anywhere from $250-600. if i get a g4 with lets say 600mhz processor and upgrade the ram to 512 or 1 gig will it be what im looking for? is it fast enough to do the simple things im wanting withought waiting 5 min for a program to load? i can not afford a new one so i am looking at the older ones... any help will be good thanks