i see that some people here want just to be fast and dont mention how that can be achieved.how the hell can a sl55 amg be enjoyable,i dont know.if you want a computer to decide about everything in your car,go play gran tourismo,dont buy cars.ferrari CS , porche GT2 and lambo are pure street racing machines,for driver enthusiasts who want to do everything in their car by themselves.big deal that the sl 55 amg is as fast as maranelo...do you really want to compare these cars??no u dont,because ferrari is much better in all other aspects.
i am a japanese fan myself,but i really admit that GT2 and CS are pure racing machines,making your heart beat faster because you just fall in love with them once you drive them.I think that the Gt2 is a step forward because of the manual transmision,but also a step backwards because of the turbos.I would go for the Gt3 instead.
But in this comparison i would go for the GT2.