A few others have said similar but I've found it always to hold true ... you get what you pay for with wireless, I've read a few times "I think" and probably "ok" or "good enough" and that's all good and fine in a best case scenario which maybe the case right now but 12 to 18 months from now it may not be the case be a good steward of the schools money recommend the fullest spec, most flexible, best laid out system, include. band pass filters remote antennas, I'd look into rf venues pads, zone combiner, etc. It may hurt a little more now but if their system doesn't work because of a new cell tower, other wireless in the area it will be much more painful to buy again in a few years or even expand ... wireless just isn't going to be what it's been moving forward and it's going to be a harsh reality for a lot of places.
These are all good points.