The Model S is lust-worthy, but it is very expensive, starting at close to $70k. Once you bump up to the 85 kWh model (for the range), the price tag jumps to $80k. As an enthusiast, the interesting model is the 85P at $93,400.
From a performance standpoint, the 85P variant is on par with a BMW M5; a turbocharged V8 powered super-saloon. That's a really astonishing feat for an all-electric sedan, considering that the M5 is the canonical super-saloon.
The new 2015 BMW M3 (4-door version) starts at $62k. If Tesla offers a "P" variant of the Model III that competes with the M3, they'll have plenty of room to price it competitively.
I'm nearly giddy with excitement at that prospect. I currently drive an M3 (coupe), and the Model III 85P is a car that I would jump at in a heartbeat.