Good Linux Server distro

Okay I'm gonna make a server

I already know about the following distros that seems interesting to me

1) Redhat enterprise ( hate how it is not free)
2) CentOS
3) Engarde Secure


Please suggest a good linux distro. for server or one from the list (not Ubuntu)

Thank you

CentOS works well, it makes some good Postfix servers, MySQL and PostgreSQL databases right out of the box. It's pretty darn versatile. :)