Looking to learn DNS, need specs suggestions

[keith.sieman]

I have a few bucks to throw around, so I figured that I'd purchase a small OpenVZ VPS and learn how to setup a DNS Server (not looking to use it for production (at least until I learn), just more as a toy basically). If I get the basic of the basic - which is 256MB of RAM, a 1 Core processor  @ 3.2GHz and a 50GB Hard Drive, should that be adequete? I can get two for approx. $30 every 6 months. How do I gauge what requirements would generally be needed for a DNS Server? And if I did turn it into a production DNS Server, would that still be adequete enough or would I have to upgrade it?