I like HP color laserjets. They have good print clarity/resolution, are built to handle the job flow in a lab environment, and have support in place when needed (HP and numerous local shops that are HP certified.) I recommend a few things...
Visit the HP site and look under education sales - choose your state.
Find the printer that matches your need. (Duty cycle / Media styles / Etc)
(Click Printers) and see what others say about the printer.
Speak to other schools - neighboring districts - and see what they like.
Make sure the printer you select can be easily networked.
Talk with your district's IT department for what is supported.
After you have all that research, the you are ready to buy a printer. Shop around!
There are deals in many places with some sites that cater directly to education
. Be sure to state that you are buying for a school.http://www.k12discount.comhttp://www.tigerdirect.comhttp://www.newegg.com
Talk with your district's IT department for what is supported. Hmm I said that twice... Think maybe I am a District IT admin??? Yep
For the record: I suggested HP because that is what we use, and are most familiar with. There are many good color laser / inkjet printers out there.
Hope this helps! Good luck with your purchase. I am sure the students are going to love their new printer!