Hello Everyone, Within the next year or so, I'm looking at buying a Model S. I'm currently making pretty good money, but at the same time, I don't like to spend more than I really need to. I've always had a rule against buying a brand new car, and while i'm more willing to buy a new Tesla than a new ICE, i'd still rather look at used stuff. Currently, I know there are some major differences between cars made before September(?) 2014 and after. The hardware to make autopilot work was installed in new cars after that point, but I'm not sure what other changes there may be in different model years. My primary question is this: BESIDES AP, what else changed between say a 2012 Model S and a 2015 Model S? I know that newer Model S's have a different way of handling braking, so I'm wondering if the regen performance may be different on new Model S's vs. the older ones. I also know the instrument panel of the older Model Ss was a lower resolution screen, but I'm not sure what the timeframe was for the higher resolution screen being installed but the cars not being autopilot equipped. If there are any other differences, it'd be nice to know them. Currently i'm at the mindset of "I'd rather have a car without Autopilot but a nice stereo, air suspension, and all the other bells and whistles." than having autopilot on a barebones Model S. If anyone knows of some magic way to get a used 85D in the $55K ballpark WITH autopilot, I'd be willing to look at that. I'll be on the highway a lot in this car, so I would prefer a larger battery pack. I'll be doing anywhere between 1500 and 5000 miles per month, depending on the time of year, work, and how often I travel from Nashville to central Mississippi. I'm open to any suggestions you guys may have, as well. I know that I'm new to Tesla (been following them since the Roadster, though!), so I may not know something that could save me a lot of time/money. Thanks for taking the time to help the new guy out!