Hard drives are the single slowest components on a computer if you have sufficent memory and a good processor. Striped volumes are the best set up for the fastest read/write speeds (ideally have to be set up on identical drives). If it were me I would make a partition for the O.S. (50gb) seeing as you cannot put the O.S. on a striped vol.. Set up a striped volume between the two raptors. Set up your page file on the stiped vol. and you have 195gbs left over for apps etc. If it weren't for the fact that you have to store movies I'd say you should be fine with what you have or maybe one more drive. Movies take ALOT of storage so, you need at least 750gb and you want that on a striped vol. Raptors don't have that much capacity. Another hard drive that I am very impressed with is the samsung F1. You can get 2 750gb drives for $300. By speading partitions over multiple drives files are being read/wrote by multiple drive controllers.
P.S. raptors are sweet, other than my memory upgrade getting a raptor was one of the most dramatic inprovements in performance for my system.
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