Getting ready to upgrade to the Macbook Pro, wondered if it was worth the big time $$ to upgrade to 4gb of RAM or the 7200rpm 160gb hdd. Want to be able to run leapord/vista with NO lags, and worried about the ram requirements. In addition, would the increase in speed from 5400 to 7200rpm be noticable, and if so, how much more of a battery drain to spin the platter faster? thanks for the info..