I am currently researching this myself.
Intel caps the cache at 64gb so don't bother using a ssd bigger than that or it will partition off the rest for you to use seperatly. Intel is selling a special drive at 20gb made for a longer life span as the cache drive will be constantly writing and reading whats on the HDD.
The cache must be set up from within windows, its a software layer and not in any way is dependent on any special hardware on the z68, its actually artificially bound by Intel to that specific chipset.
For you I think you should be absolutely fine with what your trying to accomplish. Enable Raid in the bios and set it up for raid 1 on your drives, install windows on the raid array. Then after restartign and such, install the SSD, initiate it in disk management and then set it up and use it as a cache drive.
The bios needs to be set up for Raid as it incorporates AHCI mode and other essentials for running multiple disks together. This will not effect your Raid array at all when the ssd cache drive is functioning.
heres a good take on it.
My situation is a little different though, what I'm going to attempt is setting up my chronos 120gb ssd on the sata 3 as c drive with windows installed, I'm going to partition the drive with 20 gb left over for a second drive that I can use as a cache drive... cache drive for what you say? My Raid0 array caviar blacks on the sata 2 with all the room to store my games. I am just wonering the effects of partitioning a ssd, is it the same as a hdd or is the partition more theoretical and the data is written to the disk as if the partition wasn't there at all. If all else fails I can just install my old phoenix pro sata 2 as a cache drive for the hdd array and leave the chronos as the c drive with no partitions.