Looks like not everyone is an Apple fan
I am from an ICT provider, that regularly deploys iPads and Macs in school environments, so come across your concerns on a regular basis...
Ok, so even though your iPads and Macs run different Operating systems (iOS and Mac OS respectively), this is not a problem, as they can be managed in the same place. If you grab yourself a Mac mini and the server app (depending on the number of devices you might want to look at enhancing specs, i.e. 8GB of RAM etc), you can actually enrol all of your Macs and iPads for management from your Mac server (using Profile Manager).
Profile manager will allow you to create groups/policies etc and manage all your Apple devices from one place!
The Mac server will also facilitate the integration of your Macs to your AD (check out the 'Magic Triangle' for more info on Mac/AD integrations).
As you are aware, iPads do not have a 'login' screen as such, so you can't just link them up to the AD... there are ways to get data sharing between your AD and iPads, with various amounts of labour, costs etc (also some really nice free ways of doing things!!)
Can I also ask what version of server you run?
Hope some of this helps
Scott