I found RAID 1 to be trouble since there is no safety there. An error in some write is duplicated on both so both copies are gone.
RAID 0 is harsh but fast as one drive fails or gets a little corrupted and both are now corrupted.
RAID 5 starts to get there with you being able to pull a failing drive out and popping in a new one and it automagically starts working (see the DROBO).
I'm purchasing an NAS for use as general storage on my home network. The setup will be for 2 HDDs in a Raid configuration. Mainly I'm using the NAS for storing music, video, and documents. I will be streaming the music to my PS3. As I'm searching the HDD market, I'm having a hard time figuring out what type of hard drive is best. I'm looking at 1TB size. But there are different versions. for example, Western Digital has Caviar Green, Blue, and Black. While the Green ones tend to be slightly cheaper, will they be sufficient for my planned usage or would I be better off spending a little more and going for the Blue or Black?