Dude, just test drive a Model S and you will throw all of this out of the window and wonder why you spent so much time analyzing
I realize this is mainly a complicated financial decision that includes convincing the 'Boss' to purchase one, but just thought I would share my story, good luck!
I would recommend taking the "boss" along for the test drive. I took mine. Her reaction after getting home was "that is the first car in my entire life, that I REALLY want!" Deal closed. It's that good.