Need good networked storage/backup solution. Pogoplug series 4???

So I am looking for a solution to store my media (songs/movies). I currently have a 1 TB HDD that just plugs into my laptop. I recently bought a new HDTV that supports DLNA though and so now I am looking for a way to access my media on both my laptop and my HDTV easily over the network with good performance.

I have about 160GB of music and 670GB of movies. I would like to keep the two seperate i.e. on two different HDD's.

Anyway I just bought one of these http://reviews.cnet.com/networking [...] oplay=true

I am not all that interested in the actual cloud aspects of it. I liked it as it has 2 usb 3.0 ports as well as a sata port for 2.5-inch laptop hard drives, or for compatible devices like the Seagate FreeAgent GoFlex series of portable hard drives. It also has a usb 2.0 port.

Anyway so here is my thought. I was thinking of buying 2 separate usb 3.0 externals, one for the music and one for the movies. I would store my itunes library right on the external and I would set my utorrent to download right to the movies one. I believe this would seemingly allow me to the access both HDD's over my wireless network and listen t music on laptop and watch movies on my dlna HDTV. Then to back all this up I thought it would make sense to utulize the sata port with say like a 2 TB HDD and just set both externals to automatically backup to that.

Does this makes sense? Are there limtations to this setup I am nt seeing? Are there better ways to do this? I hate having my laptop tethered to an HDD to access my movies and my music and this (in my head at least) seems to fix this and also provide a fairly easy back up solution.

Yo, let me know how this works. I'm thinking of doing something similar!