RAID 10 is always the way to go, that being said I think you're be better off going with 2 larger SSDs and mirroring them if you're really concerned about reliability. RAID 10 is still MORE likely to fail than RAID1 due to the increased number of drives and with SSDs, the performance benfit from striping is marginal. If you are more concerned about performance, I'd go with 1 large/fast SSD as opppsed to using RAID. SSD's are extremely quick even when not in a RAID configuration. If you do go with RAID, make sure your controller supports TRIM passthrough otherwise your performance will degrade overtime on the drives, more than cancelling out any benefit you got by striping them.