Thanks for responses!
I had a plugin to run non-raid disks (you see, I've configured it so long ago and it's been running well - I forgot what it was), and, of course, there are bunch of configs, e-mail notifications, share allocations b/w disks, etc.
I understand security concerns (I happen to be doing network security), but it's all take care of and I don't have WAN routing to the Tower.
Anyways, I understand that most regulars have already upgraded - thanks again for replies!