Motherboard RAID Controller failure

I recently had a drive in 2 drive RAID 0 die and take all 700 GB of data with it. I am considering rebuilding my machine and adding 1 or 2 drives to do either RAID 5 or RAID 0+1, or possibly just mirror the volumes independently.

I have a BFG 680i motherboard that uses the Mediashield software. I am reading in some places that if the RAID controller (in this case the mother board) dies, the data is lost even if the stripe data isn't damaged.

I'm trying to discover the veracity of this before I rebuild my machine. I'd rather not have two mirrored volumes as that will be an irritation, but I don't want to go through the hassle of totally reconstructing my data again. The security of RAID 5 or RAID 0+1 would be enough if I knew I wouldn't be hosed if the motherboard croked. ((Yes, I know RAID != backup)) but backing up 700 Gigs ain't cheap.

Anyone know for sure or have experienced this scenario?