I need to build a headless server for a small network to handle email, HTTP, DNS, and one or two other things. Which would be a better choice for this application, Ubuntu Server, or ...

I need to consult the hive mind on this one. I do a lot of work with Node.js & CouchDB on Ubuntu servers, but they are always virtualized, either VMWare guests or Linodes. I'm a mac guy, and I don't ...