I would use WebMin for Unix/Linux machines, or eBox (now called Zentyal) which is available for Ubuntu, both are open source free applications which should save you some money
Webmin is a web-based interface for system administration for Unix.
Using any modern web browser, you can setup user accounts, Apache,
DNS, file sharing and much more. Webmin removes the need to manually
edit Unix configuration files like /etc/passwd, and lets you manage a
system from the console or remotely.