Most reliable years for the mini cooper?

Hello, I'm helping someone purchase a car and they're very insistent on buying a Mini Cooper. They're aware it's a BMW underneath so maintenance and repairs can be pricey. They just like the charm of the car. So do I, but that's besides the point. I'm looking for the simplest model: Auto (no CVT), base engine (no turbo or supecharger), hardtop, two door. Budget around 10k CAD. From what I've read online, the 2013+ seem to be the best choice, as the base engine comes with a 6 speed auto. Any help is appreciated. Bonus points for input from people who have worked on/for Mini.