eSata RIAD 5 external enclosure?

[Megalomaniac]

it seems that NAS enclosures are a bit more popular rather than just a plain olf eSata one.

But whats a good RAID 5 enclosure? looking to do 4 drives by 750 each or so.

So should I look for a external enclosure or just go with a NAS?
having a hard time finding an external enclosure thats raid 5, but not a NAS

thanks in advance!

p.s. my goal is or storage and torrents.