I have been looking at the Powervault 745 and Snap Appliance 4200. I need some advice on IDE vs. SCSI. I noticed that you can add a scsi controller. Is this in place of the IDE? Would anyone recommend a SCSI configuration over IDE ATA 7200 in a RAID 5? Also, how important is processor and ram in a NAS for 50 users accessing the redirected My Documents folder? I have also seen a Snap 4400 with a PIII processor. Should I spend more for Celeron or P4?