I would take it the CLS over the M5 also. Even though the new M5 is a sweet car, there are alot of other high powered 4 door rockets I would rather have. The price diff is not really an issue, if you can afford an M5, you can afford a CSL55 or 63 as it is now.
2008 AW/FR E90 M3
//RAC RG63//Volk TE37//AP Racing BBK//Akrapovic Exhaust//Dinan SW//Dinan Intake//JRZ RS1 Coilovers//Dinan Monoball Control Arm Bearings//VRS Diffuser//