Some interesting speculation here, and the answer will be different for different people. Assuming that the model S depreciates at the same rate as the Mercedes S class, something Elon has promised, the new E will cost about the same as a 5 year old S. Coincidently, when the E is scheduled to launch the first bunch of S cars will be about that age. So which would you pick? (Obviously nobody is holding you to it, there simply isn't enough known about the E yet, but I'm curious to see the speculation and reasons)