I'm using my 2009 macbook pro 13' to edit raw video footage from my DSLR Canon 60D. When I edit them in Adobe PRemiere CS5, when I play the editing portion, the video not only lags, it stops, it plays like a still images, stops and then plays, like a strobe images would play, not the smooth playback that allows you to see your edited work. I have to export the edited portion to see my edited work to make sure I've done it right, if nto I have to edit again adn export again to see if I've edited right. So I want to buy a new mac that is only for professional film editing, not too expensive. I'm split between the cheapest models of Mac Mini, iMac and Macbook pro 15' (or whichever is the best for video editing). I'd appreciate your help and suggestions. Thanks.