I just ordered a Dual 2.26 everything is base except I upgraded to the 8gb RAM (adding 4 to = 12) +airport I am going to use it mostly for editing movies, and encoding, imovie, quicktime, and multi-tasking the ilife applications. My question is how I should set-up my HDDs. Its coming with the 1 640gb I am going to buy 1tb drives to fill the bays. Would you guys suggest using the 640 as a boot and run raid 0 on 2 or 3 of the others? I want to run some form of time machine whther it be an extrenal 1t drive or internal. i just don't know with apples software raid0 how much benefit I will get 2 vs 3 stripped drives and with the MP cpu power how many drives its worth running software raid on.