I started off using CentOS, and it was just too complicated for a first OS for me. I ended up switching to Fedora as I had a friend who used it in desktop mode, but didn't like it either. I went to Debian, which worked fine, but then I installed Ubuntu on a small netbook I picked up.
Since I liked the desktop version of Ubuntu, I went ahead and changed all my servers to Ubuntu 12.04x86 or Ubuntu 13.04x64.
However, I'd still like to find a stable OS that uses less resources and handles processes well, as Ubuntu seems to be using more resources than I would like.