So my library is becoming a bit too large for conventional external hard drives (over 2TB and growing daily). Currently I have a 1TB iMac and a 2TB WD external HD. All of this is backed up via Time Machine on a 3TB Seagate External HD. What I would like is some sort of enclosure that can house 4 drives and would allow two separate raids. I am hoping to combine 2x 3TB drives with Raid 0, and combine two other drives( 1x 2TB & 1x3TB) with a Raid 0. Then I would like to use the 6TB raid as my time machine drive to back up both the 5TB raid (which will house my iTunes library) and my 1TB iMac. I have looked into the Drobo but am a little leery and think I would rather a more traditional RAID. One last thing, I was hoping for either FW800 or Ethernet connectivity. Quite the laundry list I know so, thanks in advance for the help!!!