Hi,
@Spainman54. We are now 11 days away from the Model 3 reveal event on the 28th. I'm not sure if you are aware of this but the Model 3 is expected to have a 75 kWh version too. See Elon's tweet
here. Based on my calculation and a photo of the touchscreen taken while the Model 3 was charging, the Model 3 75D range is expected to be around 300 mi EPA.
Even if you are not considering the Model 3, you could wait and see what information they will release, especially whether they will confirm the 75 kWh battery and release the range number for the largest battery, AWD, non-performance version.
My guess is, the 75 kWh Model S will either be discontinued or the prices will drop after the Model 3 75D goes into production most probably in January 2018 but if Tesla releases the Model 3 75D range number on the 28th this month, then either option could happen sooner. I expect the Model 3 75D to start at $49,000. The S75D starts at $79,800. I don't think most people will agree that a longer car and more trunk space, plus self-extending door handles is worth $30,800. Both cars have the exact same height. The width is very close too. The main difference is the length.
This is going to sound a little unusual but buying a used Model S to jump ahead of the Model 3 reservation queue could be an idea to consider (details
here).
Oh, by the way, it is OK if you disagree with me on S75D discontinuing or prices dropping. A while ago I made a similar comment
here about the S60D and the original poster in that topic didn't agree with me either but a few days after I posted that message, the 60 was discontinued. So, just be aware, things could change for the S75D. I don't think it can survive without a discount.
The Model S production line is not as automated as the Model 3 production line. Therefore production costs are higher. I think the S75D price will never drop below Model 3 75D + $20K. So, I'm predicting either ~$11K discount (40% likely) or Tesla will discontinue the S75D (60% likely) within 6 months after Model 3 75D range number is released.