The 80GB VelociRaptor died yesterday in my mac pro at home and I need to replace it. I am trying to decide between a single 300GB VelociRaptor or a pair of 150GB VelociRaptors in a software RAID0 for the OS and applications. All of my data is another drive plus there is a Time Machine drive installed along with a Drobo FW800 connected. I know the added risk involved with a RAID0 and am not concerned about that. If I do go with the RAID0 I was thinking I might get the Pro Caddy 2 and set up the RAID in that. Then in the future I would like to setup a RAID5 with the 4 hard drive sleds. Any ideas, suggestions, or comments would be appreciated.