I am going to switch to Mac, and i hope to stay on the Mac for the rest of my life. Biggest thing i hate about Windows is lagging and freezing. For example when you launch an application it takes tens of seconds to open and it just can't handle it the right way, lags all the time. I really don't want to see that on a Mac. I am planning to get the 15" 2.4 i5 MBP, will i see "any" lag on this machine or do i need to get the 2.53 Ghz model? p.s. i don't do heavy stuff, i just watched Mac Support tutorial videos on apple.com and iLife really interested me, i'll be doing those, music, surfing, mail, regular computer stuff. Some paperwork, presentations. I mean lag when using iMovie would be the worst thing when switched to Mac with high hopes. thanks for your replies.