As a former Head of IT in secondary schools I have to agree with the above. Also many schools lease their computers and have maintanence contracts limiting them to particular makes, the lack of cash means having a mixture of makes etc impractical.
The other issue is of licensing, will the machines be provided with a license for the OS? again lack of cash will stop schools buying them.
All in all I would go along with the ideas stated by Goates and Under-Exposed.