[Bajie]

Every time porsche update their cars, they are leaps and bounds ahead of the older model.
As mentioned above, the C2S is argued to be a better drivers car than the C4S.
I would go for the C2S. I think it would make for the better drivers car and maybe would not have the turbo genie suggesting upgrades for more power.
The one you have pictured also looks mighty fine.
Funny, but the turbo actually does look old when you go from one picture to the other.
Get the C2S!