Best storage option for 50+ TB ?

I have twenty three (23) 3TB drives which of course are SATA III. I am trying to build a home theatre and I first tried to build a computer with two SAS PCI cards (each supporting 8 SATA ports) and then using the 9 on board SATA ports on my motherboard. I was then going to use FlexRaid (software raid) to handle the raid of all the drives. It didn't work too bad but that many drives isn't very stable, sometimes it just doesn't start up or it randomly crashes at various times. Also my motherboard BIOS only can see 9 drives and if your startup disc doesn't make the cut then it won't start up to it. Most of the time that's not an issue but I'm at the point where I want to start looking at just using a couple of shelfs for storage. Dell has some great power vaults that I've used before, the MD1000 and MD3000 are awesome and cheap but they don't take SATA III drives. Every shelf system I've looked at that supports SATA III are like anywhere from $3k to $15k per shelf. All I need is a couple of shelfs that can take like 12 to 15 drives each, that's all. Does anybody have any recommendations how I can do that easy and cheap? My plan is to just have a small computer by my TV that connects to the storage system over IP (house is wired gigabit).

Or is the best & cheapest solution to stay with what I have and just try to figure out why it's a little unstable? I have a EVGA Classified X58 motherboard with a first gen i7 processor in it but the board only supports SATA 3 Gb/s. I don't know if that part of the issue but the 9 onboard ports read the 3TB drives ok and I was ok with slower speeds because it's just a media server. I've been working on this project for about a year and FlexRaid was a little dicey a year ago with respect to writing data but hopefully they have solved that by now.

Any help is appreciated guys, thanks!!!!