Hi kevin39,
I don't yet understand the benefit to have his own dns resolver server.
If you want not to use your ISP dns (and I can understand it if you are for example in France), there are several free (and not google) dns servers (see
http://en.wikipedia.org/wiki/OpenDNS).
Then no resource is used for this service :thumbup
So you just need to change the dns ip for each host of your LAN (and also for your NAS).