Just stopped in to say farewell - picked up a Netgear ReadyNAS RN102 today - going to swap the old disks from the DNS-323 over, reformat them and move forward.
The ReadyNAS seems to be a nicely built unit, metal chassis, a nice big, quiet cooling fan and has a bunch of features the DNS-323 should have had and didn't, like multiple USB ports, the ability to expand storage through those USB ports, and (this was what spoilt the DNS-323 for me), the ability to back the unit up to external USB storage - these last two were features that D-Link could have added, but chose not to.
The ReadyNAS also has an eSATA port and can accommodate an optional 6 bay expansion chassis, and the icing on the cake, iSCSI support, all for the handsome price of $199.99, which I believe is exactly what I paid for my DNS-323 back in the day.
On paper, the ReadyNAS looks like something I can recommend to small business clients (I though the same thing about the DNS-323 also), we'll see how it works out in reality.