NAS hands down.....plus you get RAID mirroring, you get hot swap, auto rebuild, etc.
NV + NAS http://www.newegg.com/Product/Product.aspx?Item=N82E16822122010
NV+ NAS Unit w/ two 1 TB Dives (1 TB of Storage in X-RAID) - $478
NV+ NAS Unit w/ three 1 TB Dives (2 TB of Storage in X-RAID) - $568
NV+ NAS Unit w/ four 1 TB Dives (3 TB of Storage in X-RAID) - $658
I been using one for 4 years in June (original HD's)