First, you won't set up the drive in RAID! But you do have to set up SATA in RAID in the BIOS.
You will install the SSD, and using the iRST software, set up the SSD as a CACHE drive for the HDD.
The iRST software has a 64GB size limit for the cache drive.
I'd recommend, just like if the drive were for OS/Programs, in this order: Intel 520, OCZ Vertex 3, Samsung 830. All either 60 or 64GB models.
I assume that you have a Z68 (or higher) chipset on your motherboard. Only these will use the "hardware" to accelarate the drive(s).
If you don't have that chipset, then the OCZ Synapse works, but it used software to accelarate. But these drives are pricey,