I'm on the verge of springing for an install of two Vertex 3 240GB SSDs into my new iMac 27" i7. (Removing opt disk for 2nd SSD.) But I have gotten conflicting reports as to whether or not this is a good idea. I am doing a lot of video editing and was told to get external Raid 5 scratch, but I am at a loss as I thought the high-speed SSDs striped would rock. Can anyone explain the pros and cons of each?