I am currently making the switch over to mac after getting my macbook pro 13" two years ago. My question is should I buy the 2007 mac pro with 2 dual core 2.66 ghz processors and 4 mb of ram? I want to be able to run after effects, cinema 4d, and final cut all with little problems. I currently have a pc with an intel i7 920 and 6mb of ram. Would this be a significant downgrade or should I just save my money for a more powerful mac pro or even an iMac?