won't be as fast as an SSD, but near the same performace, but more storage
i really just want to store a bit of totally legit movies and music, but i also want it to last.
I can't recommend Raptors for RAID. especially not RAID 0. If you want speed and durability for large storage I'd have to recommend WD RE4 drives, 4 of them 500GB in RAID 0+1. It will give you RAID 0 speed, 1TB of storage but also redundancy if one of the drives fails. You can buy them for $90 each right now, that's pretty cheap for enterprise grade HDDs.
Raid 5 is your friend.