Just to update, he didn't go with the supercharged one in the end but has just landed himself an 04 Alpina Roadster S with Lux pack.
Now, I've never liked the look of the Alpina in the pics but this thing looked the dogs in the sunshine on Sunday. Interior was fantastic with all the extra leather, although the Alpina plaque with the build number etc on looks like it came from the local trophy engraving shop!
Engine and exhaust sound fantastic - really deep and throbby - a million miles away from the metallic raspy M cars.
Problem is power and torque are pretty similar to my Zed but it weighs over 200kg less. I'm screwed!