Haha, Kizer, let me guess, your build has been running great for about 5 years?
I came to the forums looking to upgrade my 4TB setup as I've finally maxed out my storage. My system has been running flawlessly since I built it, so much so, that I haven't even kept up with the updates to unRaid (still running pre v6 unRaid, maybe something in the 4 range). Seeing all the things it can do now has me wanting to update the system and I have nearly the exact same setup as you, so we must have pulled from the same budget build.
I pulled up my newegg order confirmation and see I bought them on 5/9/11, so I figured yours was right around the same time...
Anyhow, thanks for your post/question, I'll be following along and probably using the same hardware setups.... though, it appears I still needs some more info on the extra drives it can use now... (cache drive?)
Nelson