The 2007 CTS 3.6L Sport is the most fun I have had since I drove Porches 15 years ago. I didn't know a sport luxury car could be this much fun. The OnStar and XM radio features were unexpected fun and insurance in the case of OnStar. Getting into the car and having the seat and mirrors go to my preset postions is a nice feature. The car has more than enough power @ 255hp ( I didn't get the CTS-V - V8 because of gas mileage).
Independent suspension coupled with solid road control ( I have 18" wheels) and memory package for seats and mirrors. Plus XM Radio and OnStar with hands free phone and monthly car diagnostic email reporting.
I recommend a larger trunk - at 12.5 cubic feet you can only get 3 sets of golf clubs in the trunk and that is a tight squeeze.