iPad mini 2 or iPad Pro 12.9 inch
iPad mini 2 would be fine, but if extra bucks isn't a problem to you, then iPad Pro is on another level.
I like iPad mini 2 because it's cheap, portable and overall it's a very good device.
Now... If you like to watch movies and play some games, then iPad Pro is on another level of experience. Mostly, the 12.9 inch.
I have the 9.7 inch one and it seems like a baby version of the 12.9 inch version. So, if someone decides to buy an iPad Pro, might be better to spend some extra money and buy the 12.9 iPad Pro.
However if you do not want to spend a lot of money but still want to own a good device, i recommend the iPad mini 2