Right now I have MB403LL A Macbook (not Pro) Intel Core 2 Duo 2.4 GHz - 13.3″ that I've upgraded to 4GB RAM. Thinking of the new 13" sandy bridge Pro that just came out, but it says that processor is on 2.3GHz -- would that be slower than my existing 2.4 GHz for video editing, or faster since it's a different kind of processor? Also thinking of buying a close-out old 13" Pro, Intel Core 2 Duo 2.66GHz, 4GB RAM (would upgrade to 8GB), NVIDIA GeForce 320M, SuperDrive, Aluminum unibody(MC375LL/A) -- how would that compare in speed for video editing compared with the two models above? Would appreciate multiple opinions, so if you see this has been answered, still would love your two cents. Thanks!