Honestly, I recommend OpenDNS rather than setting up your own DNS daemon. It's a lot simpler, and you can avoid the OpenDNS search pretty easily if you install the updater, which keeps your IP current to OpenDNS so it can reply appropriately to your shortcuts.
But if you must do it, you'll have to be aware that your DNS server will need to rely on a very reliable upstream DNS server like your ISP's or OpenDNS anyways. Still, your own server would be able to cache your previously accessed sites and save you some headache when your upstream DNS server goes down. I'd suggest you use OpenDNS for that system's DNS server...and you can set up rules that kill OpenDNS' search page trap. I also believe that OpenDNS allows you to disable the search page redirect. If not, just install an addon that lets you redirect your browser to somewhere useful like Google, or your search engine of choice.
I've used OpenDNS for about two years, and it's very reliable. I've had no problems with it.