According to my local delivery rep, I can pay $500 to change the order to a 100D, the differences being:
1. I would no longer be eligible for free, unlimited supercharging.
2. My vehicle would not be built with ventilated seats.
3. Estimated delivery would likely be late March (compared to late February-March).
4. My car would be super super slow.
So, I would apparently lose my place in line, but late March isn't the end of the world.
LOL.. Yeah.. My 90D is super slow... Not. I think you made a wise decision and will get the same range and save $36K.