Those of you who use the previous gen Mac Pro's, what are you using for an external RAID solution? To put it into context I'm looking at needing 16TB of raw storage set up as a mirrored RAID set, so effectively 8TB total. I'm using an OWC RAID card now with a mercury elite pro 6TB. That seems to work well, and is pretty fast. I don't need cutting edge speed. The RAID is for backups, both from CCC and time machine. Any brand / configuration recommendations when hooked up to a 2009 Mac Pro with server 5?