Okay, I have two choices. 1. Apple's Mac Pro RAID Controller, Four Drives, RAID 0+1 One big disk, highest cost. 2. Or, some other RAID Controller (?), Three matching drives, RAID 5. Then, 1 big drive for OS/Applications/Time Machine. I'd probably move my Home folder to the RAID Array and have just my data striping amongst those drives. Has anyone had a dilemma like this before? I like the idea of hardware separation of my Home folder from the OS.