Ready to make my first Tesla purchase but trying to decide between a used 2013/14 85 vs a new 70 ---with the tax credit would be about the same dollars. Any advice? Like the new warranty and options. Next question, if going to be in AZ most of the time, is there a benefit to go to the 70D? General advice and experience would be appreciated as I make the leap I have been looking forward to the last couple years.