I have an 2008 mac pro that I'm thinking of getting a velociraptor for. Originally I was going to just get the 150GB model (from 2008), but the 300GB model is a better deal and might be better for expansion. (I would just be using for my boot drive) However, there are also the new revisions at 600GB which are about $100 more than the 300GB model, but also have SATA3 and 32MB Cache, so I'm wonder if it is a mistake going with older technology. However, I think 600 and even 450GB is too big for my purposes. I know that the retail version of the 300GB model didn't fit the mac pro, but the OEM model did. Does anyone know if any of the 600 or 450GB new models will even fit the Mac Pro?