Hi i have a MacBook from 2008 and am starting to get more serious with video editing i am wondering if i need to upgrade anything or get any extras that i don't already have. Pretty much i am wondering if my computer can handle editing HD footage. It has a 2.1GHz intel core 2 duo processor. 4.5gb 667mhz DDR2 SDRAM memory. I have two external screens and 1 500gb external memory. Any suggestions would be much appreciated.