Primary School they use ICT as a cross-curricular subject (based on my current school anyway), so the IT Network does not need to be complex. Children usually use Word, Powerpoint, Textease, 2Simple, Wordshark, Comic Life, etc, so you will find it very easy as compare to Secondary School.
Staff are also much more happier once they have got good equipment that they need for their lessons e.g. IWB, visualizer, camera, a computer.
In term of back-end, a curriculum and an admin server will serve everything needed for Primary School.
You have to convince the Head Teacher and the SLT, if you want anything fancy