Best Gen 3 around 15K?

My goals are safety and comfort, and I have a budget around 15K. I want to get forward collision alerts and blind spot monitoring, and I'm happy to get 15-inch rims to get a better ride. I've got to have a backup camera. I drive side roads, so I'll add a donut spare if needed. The parking assist is a nice feature, as is LKA, but not a must. I don't like sunroofs, because they take head space and leak, but I like the HUD that comes with it, and I'm in New Mexico, so the solar ventilation might be nice.

I'm thinking of something like a 2012 Five (not V) with ATP. I know BSM is standard since May 2017, but I don't know if it's even available in Gen 3.

Are there significant differences in reliability issues with items like head gaskets and inverters between the various years of Gen 3?

Thanks for all the excellent info here!

--Cy--