Why bother, archieving, a 5400rpm eco type drive will be next to silent, but most importantly, will turn off at idle using no more power than a ssd, nor making any noise nor producing any heat.
The only thing I dislike is, I like downloading to my mechanical drive to save writing so much to my ssd. I did have 2x fast 640gb's in raid 0 as thats how they were setup as my main drive before having the ssd. I do love how fast checking par's, unraring is on a nice raid 0 setup but they won't power down so you get constant two drive noise never shutting down. Since split them into single drives with a 1.5tb as backup, its much quieter and shuts down whenever its idle so even less noise and power. But damn if par checking/unraring is slow on a single drive setup.
I'd be tempted to get a smallish slc based ssd just for the downloading drive so when downloading overnight its silent and unraring and par checking is uber fast.