Heya,
Ahh, a simple solution for you. Go on Ebay and search for "PERC 5/i". You should find them for $70~150. It will support up to 8 drives. They're normally really expensive, but, people sell them out of servers very often and you can get them on ebay (just looked, saw several) with buynow options. Scoring one of these for less than $200 is like buying a porche for the price of a civic. They're high end grade stuff from dell servers. You just get appropriate wires and you can link 8 SATA drives to it from two backwards compatible cables. Does RAID5, hardware. Amazing card.
Very best,