Yeah, I would not be apposed to switching from the M3 to the ISF. I like and respect the ISF. It may not be as fast on the track as the M3 but I don't track cars anyway. IMO, if for some reason I had to get rid of my M3 (like the wife is pressuring me to do cause she hates the 6MT), then I def would take the ISF over the C63. The C63 is a beast and I respect that but I just really don't like MBenz...... I'm trying to get the wife to hold on for a little so I can see what happens with the new M3 coming out. She said ok but has taken the keys to my new Raptor and is driving that.......