I have the 150gig Raptor from what, 4 years ago? 57 gig boot drive. I am trying to do some speed bumps to a 2006 Mac Pro, and I'm down to the choice of an SSD, or a Velociraptor. But, I am curious if there's any appreciable differenece between the older Raptor, and the Velociraptor. Since I only need like 60 gigs for my system drive, the 150gig version is fine. Is the Velociraptor worth the money over an existing Raptor, where only speed is the factor, not capacity?