Bit of a contrarian here, even though no one else has posted yet.
I would take that money and buy new instruments with it instead of wasting it on technology like this.
You'll spend all this money on tablets or laptops that will be obsolete in 5 years, or not work, or get dropped and be cracked/nonfunctional, or something else. In 5 years, every instrument you buy should still be serviceable for your program.
If you HAVE TO spend the money on tech, buy things like an electronic drumset, electronic mallets (like MalletKat), a Harmony Director, and upgrade your projector to one that's more HD. Buy the most powerful Mac computer or gaming rig desktop computer you can afford, then put the latest versions of Pyware, Finale, and every other software suite you use regularly on it. If you want to get REALLY expensive, buy a Wenger practice room module.
SmartMusic is now fully browser-based. You don't need anything but an internet connection and a relatively modern browser to use it. Kids can do it on their phones or their Chromebooks that the school likely provides. There's no need to have a separate set in the band hall that YOU are now responsible for with no maintenance budget.
Plus, with getting the technology - that's all well and good. Are you going to get the budget increase to pay annual SmartMusic fees, for the practice room subscriptions, and the campus subscription? Will you just pass that cost on to your kids in terms of band fees? Will that drive kids out of your program?
If you were able to purchase a class set (about 30) tablets or laptops, which would you prefer for band and why? Planning to use them for recorded tests, Smart Music and other Apps.