Looking to buy a Telluride in the upcoming months. Torn between the S or EX. Upgrades that would be nice between the 2 are the bigger screen, ventilated seats, wireless charger and the power liftgate. Not sure if it is really worth the money? Would prefer 2nd row bench over captains chairs. Could anyone tell me if there is any difference in the ride between the 18" and 20" wheels? Is it that noticeable of a difference between the 8" and 10" screen? What about the highway driving assist?