As the name implies, its main purpose is for "Server" use and not as a client or a workstation plus as what win2kpatcher says, its a very expensive OS except of course if you wil use a pirated copy. I wouldnt use either if I were you, the fact that it is illegal, you will surely run out of problems.
Stick with your XP, its one of the best OS if you can fullt use its great features.
Cheers.
dx