I would look at some kind of MFP in the 35 copy per minute range. I would recommend a MFP from someone like Ikon, xerox, canon, ricoh or someone else because you can get a fixed price per page which would include supplies and service so when users do stupid stuff it's covered. Also you don't have to worry about supplies not lasting as long as they are rated because everything is included in the cost per page.

I would not expect to get more than the toner and other supplies are rated for the ratings are for a very low coverage (5%) I never see people the number of pages toners are rated for.