I am looking to set up a RAID 10 array to speed up data write speeds and to add a secondary layer of protection for a business critical Macintosh Pro G5. This machine currently houses 4 SATA ports, but software limits me to 1 or 0. Can I get a recommendation for either an internal controller, an external drive bay option? Cost is a concern, and I would like to avoid 600+ $ price tag that apple shows on their website (not to mention the lack of configuration option that I am looking for). This machine would host the Mac OS on a SSD, and the 4 disks in RAID would be data only. Anyone with experience that could throw me some advice would be thoroughly appreciated.