GTR. I've seen so many chicks driving them it's not even funny. Bet you could pick one up that wasn't taken past 3k rpm more times than you could count on one hand.
The C63 is a great car, but damn, the GTR is just one step higher.
E92 335i: Space Grey|Coral Red|Aluminum Trim
Hold out for the BRZ STI or... Rocket Bunny FRS.