If you like performance, and you can afford the performance, get the performance.
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It has noticeably more torque at the low end (443 lb-ft compared to 325 lb-ft for the 85 kWh and 317 lb-ft for the 60 kWh). Of course, you need sticky tires and decent pavement to make good use of that, but the performance is clearly faster from 0-30 when going to the performance. (In contrast, the nonperf 85 kWh isn't that much faster 0-30 than the 60 kWh).
Personally, I would have paid more if I could have had more performance.
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I would have paid less if I could have had the performance with a smaller battery pack.
If you do spend the extra money, I wouldn't expect that it will come back in resale value. I firmly believe this car will depreciate at least as fast as any car. What will my 2012 Model S be worth in a few years when Tesla has a new model selling for less that has similar performance, adaptive cruise control, collision avoidance, etc.?
Incidentally, the first question that everyone asks me when I tell them that my car is electric is "but how far is its range". It's nice to tell them it's EPA rated at 265 miles. That's one nice benefit Tesla got by only selling 85 kWh batteries at first.