I presume that there is the odd user on here by now so would welcome any input if so. I started looking cheap, but to get one that really does the job and is reasonably fail safe I am looking at the new DJI Phantom 3 Advanced which is the complete package and gets excellent reviews. Just clip on my iPad Mini 2 which is Retina resolution and ready to go. Like Apple price seems to be fixed at £890 from reputable companies or £717 from China with poor reviews, pretty useless back up, and almost certainly import Duties added on.
http://www.dji.com/product/phantom-3#page1
The spec looks excellent and seems to cover everything plus it uses open software so Robin could write me new Apps, ie:- waypoint following that has not been included yet.

tut