In the state i lived in and the school system I worked in, the state provided funds to the school. The school board determined where the money was spent. My experience with IT at the school, and the teachers in general, is neither cared about speed, or the latest desktop or laptop! In fact, we are Mac centric, have been for years, and I had one teacher, with 15+ years of Mac 'experience', and she did not even know how to make a FOLDER!
I think you stated that 2/3 professors qualify for a new laptop. Depending on what they use it for, the current c2d might work for them anyway. You said they need to put in a request. If their request is for a Macpro, would the IT advise them to switch to a Dell or whatever?