Got either x3 500Go Hdd and one SSD for the caching, now. This solution does suits me and boost my system disk pretty well & is smoothly working every-days life. Caching can be enhanced or maximized for better performances.
At the moment this solution is quite painless for my budget even if i know that it gets cheaper. Still need space for storage and i do like splitting/organize my data on different drives.
Looks Caching was for corporations before and had been extended to public, as a solution for those not bothering for the SSD prices. But this was some little years ago.
SSD had been very well accepted by manies and seems common to mount the OS in this manner w/hdds for data & to match the WEI either on their scores.
Guess Sata Raid system controller isn't the best for servicing your disks, but i get use to it and know what i have to do most of the time to maintain the all lot.
I'll go for it one of this day, anyway...