Are the majority iPhone or Droid-phone users? I find that those familiar most with the phone will find the similar transition to a tablet more confortable (iphone to ipad, Droid-phone to droid-tablet).
And does your I.T. allow iPhone/iPad/Droid/Tablets access on your networks, or only Blackberry devices?
Whichever you decide to spend money on (iOS or Droid based), the site/app to use IMHO is http://www.autocadws.com
Start with some of our most frequented solutions or visit the Installation and Licensing Forum to get help installing your software.