Originally Posted by bsodmike 
Would one be looking at say an attached Western Digital My Book Studio II (1TB, 2TB and 4TB) or maybe a NAS solution like Netgear ReadyNAS Duo or Western Digital ShareSpace ?
Would be looking at RAID 1 mainly...
I use two two-bay QNAPs and do RAID1 on 1.5TB drives from Seagate. Works brilliantly, I have them plugged into my TimeCapsule and stream my media from it. Eventually I will put my iTunes library on it and manage it via TuneRanger - total safety.
I wouldn't want to go back to non-RAID. It's a nice, safe, cosy feeling... ;-)