In my opinion the 2016 QX60 would be the model to get even though the 2017 and 2018 models are out.
A few reasons that I can think of are:
- the 2017+ models come with an approx extra 30 horses because it's direct injected. So far on the market, plenty of cars with direct injected engines have had issues with carbon build up so I would wait to see how the direct injected QX60 engine holds up over time (ford replaced cylinder heads every 30,000 miles on eco boost engines because there was no ford approved way to do an induction cleaning without frying the turbo due to increased temps which would void the warranty)
- the revised front end with the grille, the headlights to resemble the Q50, LED fogs and DRLs, and revised rear lights I think look better and more aggressive than previous models. 2017+ have chrome surrounds around the fogs instead of the silver ones( I prefer silver ones)
- the interior recieved some minor changes that just make the car feel more premium than previous models (the new shift knob, the trim bezel around the shifter, etc)
- the biggest update to the 2016 is the handling upgrade to the suspension. The older models had a very soft suspension which allowed for body roll in curves at high speed or turns on streets which was to close for comfort for me (I may be used to mine 2016, had a 2015 QX60 as a loaner from the dealer). They stiffened up the suspension and dramatically reduced the body roll for 2016 but it's not a harsh ride which I like.
I just use an adapter to plug in hdmi into the rca inputs for the theater package. The screens are not huge TVs so the resolution difference between the 2016 rca and the 2017+ hdmi are not noticeable in my opinion.