hey guys i need your help..........i wanted a macbook for a while now and was going to wait til christmas time to see if a new revision came out. but for school now i actually need one and i need it fast. i just don't want to pick one up now and in october there's a revision. what do you guys think the chances of that happening are? how much will i have to pay extra for leopard? are there any other legitimate reasons to hold out?