For me 2TB is plenty so I bought 2 USB 3.0 Canvio Basics and plug one into the router (which has a NAS feature.) I'm done and spent under 99 bucks a drive.
I think this is why the NAS space is not very active.
1. Routers do this.
2. I can use small PCs to do this.
Let me expand on item 2. I did pick up an Intel NUC for not much (compared to what's in it.)
This one: http://www.amazon.com/gp/product/B00XPVRR5M
I went the extra mile with 8GB RAM but for file service 4 would be fine. I could pop a 2TB HDD inside but went with a smallish cheap SSD and externals for the space.
My old DNS-323 just died—what should I replace it with?
There's a couple of Mac's and a Roku and I'm looking for the best home NAS for data backup, media storage & sharing.
I think I want:
2 drive bays (affordable, but still gets RAID)
Some media serving capabilities. I’d like to send music, videos, pictures to my TV–but I don’t know whats possible.
I started to look at Synology and Qnap, but they seem geared for small business not home use (or maybe an advanced home user).
I haven’t looked at this space in a while, and I’m surprised that its not more active…With more mobility and more devices, I expected this space to be hot right now. Maybe I’m just missing it.
What are others using?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic