Ok, I currently have a 250 gig (stock) boot drive, and a 320 gig capture scratch drive in my mac pro. For christmas it looks like i'm getting at least two 500 gig drives. While I could be happy with that and leave all four bays filled, I am pondering if it would be a speed boost to use a Raptor X 150 gig as my boot drive? If I do take this route, I will probably add another 500 gig to the set up and put both the 250 and the 320 into external enclosures. So I guess my question is whether the raptor is worth the price for a speed bump? Is the speed bump actually noticeable compared to the stock 250 gig? Thanks.