Create a group policy to make certain Domain Users, Power Users

Create a group policy to make certain Domain Users, Power Users
We have some 200+ computers in the organization. I want help desk support to be able to perform basic maintenance on these computers but have no ability to make changes in active directory. How can I give them LOCAL Administrator or Power user status on domain computers without making them Domain Admins. I can use the Domain Controller to add the help desk group to power user or administrator groups on the computers but I will have to do that individually for each computer for each computer. Is there a more efficient way to accomplish this?

We are using Windows Server 2003 on domain controller and most of the computers have Windows XP pro installed.