I don't know that much about the new ones (I have a 16 hybrid), but ins't the PCM screen on the 19 fairly different? I think 19 is the year they updated the body style. I'd go 19 because of the upgrades...

On the hitch, that seems really pricey for a hitch that costs $6-700. Have you tried looking at trailer.com?

Good luck in your hunt

JE