I think you are running the risk of selecting a product and finding solutions to make it work for you. As others have said do you really want to be tied in to one vendor - not me.
Apple don't discount hardware for education in the way other suppliers do and even the ones they do offer are tiny. The hardware itself is no more reliable than PC hardware and in my experience less so and far more expensive to repair. If the logic board fails on a 2 year old iMac you might as well throw the whole thing away.
I'm not against Apple kit - I have an iMac at home and 60 iPads at school but I do have choices and I have been asked to trial some Windows tablets which I'm looking forward to!