The 2014 Porsche 911 Turbo S was tested by Car and Driver at 2.5 seconds 0-60, and it's ~$200K, depending on options: http://www.caranddriver.com/porsche/911-turbo-turbo-s
I suspect the 2015 Turbo S might be a bit quicker.
1. next year's needs to be quicker on paper by a small margin
2. the 918 needs to be the fastest on paper by a large margin
what's remarkable about the S is it can do launch-controlled full throttle runs to 60 repeatedly. most other cars in this acceleration class (this new tesla, gt-r, veyron) are simply incapable of that, for various reasons.
well, maybe the veyron, but who really cares because it's ludicrous for other reasons.
The car computer actually prevents you from doing too many launches to avoid damaging the car.
I'm sure you've seen this, but it's amazing nonetheless: https://www.youtube.com/watch?v=A5DRCTW-Q7o
http://www.caranddriver.com/features/the-2015-porsche-918-sp...