With regards to wireless costs for Wireless a Meraki Solution costs are roughly ~£500 per AP (MR16) with the enterprise cloud license (for the cloud controller/support) ~£100 per year per ap, so 25 would be circa 2.5k for 25.
You may find they do educational discounts but I am not looked at that yet as not been required to.
Compare that with the Meru system its slightly cheaper, the benefits of the Meraki system is that all updates to the controller and access points happen automatically and the web interface is so easy to understand compared to others i have used!
So 25 x 500 = ~12500 + 3 x £2500 = 20k
Meru (on rough pricing above).
1 x controller = 7k + 25 * 450 = 11250 + 3k for support = 21250