Which of the above is the best roadster? What do people think?

Here's a Russian article. Can anyone translate this.
http://bmw.carclub.ru/articles/allarticles/0000004340/

I'm not sure which one I'd choose. I probably lean towards the Z4 M,
but Boxster S has probably better handling. Recently Boxster S won vs
Z4M in a comparo. SLK 55 has nice hardtop but no manual, but has
presence (read: chicksmobile?) from the front like the SLR. I think all
are winners. Any thoughts?