Jason, the short answer is that any RAID controller that's compatible with RedHat 7.3 should work with SME 6. The 3ware cards are a popular option for IDE RAID, as they're (IMO) reasonably priced, well-supported, and very fast. My server is a Dell PowerEdge 4300 using Dell's PERC2/SC controller, which works perfectly (Dell has drivers available for download, which will monitor the array, but they aren't needed to use it).