Which ubuntu version should I use for a new server?

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http://serverfault.com – I will be building a new server for a small network of Windows XP and Windows 7 machines. The server will provide the following services: Samba primary domain controller ssh mailserver subversion server intranet webserver web proxy dns for internal adresses Also, I would like to continue using a browser based frontend for administration (currently we use Webmin and I like it) Our current server, is running Ubuntu Server 10.04.2 LTS. It is showing its age, that's why it will be replaced by the new one. But the overall stability and performance over the last 5 years was very good, so I want (HowTos)