If BMW comes out with a hardcore e92 M3 closer to the GTS without the price tag, I'd sell mine and get it right away.
Lighter, better adjustable suspension, and a decent braking system. I don't feel like there's a need for more power if the car is lighter.
2013 E92 ///M3 Space Grey w/ Fox Red
M Performance Exhaust, KW Sleeve Over Kit, and cosmetic upgrades