for me it was all about how the car made me feel....
I enjoyed driving the z4m coupe but didn't fall in love with it, maybe because I didn't give it enough time and miles (only drove about 3000 miles in it)
For some reason I didn't love the Z4M roadster, I test drove 6 of these......I test drove 2 s2000 and loved them.....
Everyone else is spot on with the Honda s2000 characteristics, the shift, the vtec is a bit of a marmite thing, I happen to love it, and I love the way it looks also.