Hi SuperChicken,
If you are going to be imaging XP Pro then I suggest you get licenced for and obtain a Volume Licencing copy of XP. This version does not include activation.
However you can only use VL keys with VL CDs and you must be a member the appropriate licencing agreement to recieve VL software.
I'm afraid this is the only way I can see to image the computers without the need for activations.
Hope this helps
Stuart B