Looking for a decent dual-bay 3.5" drive NAS box for my home network, something in the < £100 range preferred - whilst all answers are responses, not all responses are answers, but any advice is appreciated 
My current network set up is a TP-Link WDR3600 running in to a Virgin Superhub in modem mode. Off the TP-Link I have an HTPC and my desktop running off gigabit Cat 5e. A couple of laptops on wireless.
Currently the HTPC has a 2 TB 3.5" drive, and as to date it's also been acting as our backup network drive it has now got to the point where it is rapidly filling up.
So, I've picked up another 2 TB drive, and I plan on upgrading the HTPC to 3 or 4 TB, and repurposing the current 2 TB drive in a raid-1 array with the new one.
All well and good, but the HTPC chassis can't fit any more 3.5" drives.
The main two drives I've been looking at so far - the D-Link ShareCenter Pulse DNS-320L and the Zyxel NSA325 both seem more or less to fit the bill.
Of the two, the Zyxel seems the better as it is both quieter and has better bandwidth performance (I keep reading that the D-Link only pulls 11MB/s?)
Any suggestions gratefully received.

My current network set up is a TP-Link WDR3600 running in to a Virgin Superhub in modem mode. Off the TP-Link I have an HTPC and my desktop running off gigabit Cat 5e. A couple of laptops on wireless.
Currently the HTPC has a 2 TB 3.5" drive, and as to date it's also been acting as our backup network drive it has now got to the point where it is rapidly filling up.
So, I've picked up another 2 TB drive, and I plan on upgrading the HTPC to 3 or 4 TB, and repurposing the current 2 TB drive in a raid-1 array with the new one.
All well and good, but the HTPC chassis can't fit any more 3.5" drives.
The main two drives I've been looking at so far - the D-Link ShareCenter Pulse DNS-320L and the Zyxel NSA325 both seem more or less to fit the bill.
Of the two, the Zyxel seems the better as it is both quieter and has better bandwidth performance (I keep reading that the D-Link only pulls 11MB/s?)
Any suggestions gratefully received.