Thanks, I'll try the LSI megaraid route. The H700 supports 8 drives. It has 2 SAS connectors, and you can use 2 4 way SAS to SATA cables ($10 or less on Amazon, Ebay, etc). I think I ordered 2 but I misplaced one somewhere.
I was concerned about using it in a non-Dell system with non-Dell drives, but no issues so far (I think most of those issues were corrected in an earlier firmware).
Edit - Hey the Megaraid software works! Downloaded 16.02, it...