Any video card will be fine provided they have support for windows 7/vista. Those drivers should work with windows 2008 server.
For windows 2003 server I've had windows xp drivers work just fine, but generally speaking any video card should work.
If you need autodesk support for example and they require quadro video cards then you'll have to get quadro video cards for "official support". The reason why is because of how the drivers are written is more fine tuned for development rather than gaming.
Could anyone recommend two other video cards that officially support windows server OS such as Server 2003 or 2008 besides the NVidia Quadro series?