SLK R171 vs BMW Z4

Hello Together, I’m very attracted to having a convertible as a second car for the summer. My budget is up to max. 12.00€. The most interesting candidates so far are the SLK R171 (find it more beautiful than the R170 and technically more mature) or the BMW Z4, possibly even the Mazda MX5. I like the 6 cylinders – if already Cabrio please with appropriate sound. I know, I am in the MB/SLK forum, but would still be pleased about your opinions and experiences. Although I’m more interested in the technical aspects, design has every preference: How durable is the car, how vulnerable is the car for workshop visits, costs of spare parts, value of the interior etc. Corrects me if I’m mistaken, but the 2/3 roadsters are actually quite unconvinced if you take my budget into account and since second car is enough a two-seater. Or about the advantage of a CLK Cabrio or BMW E46 Cabrio when I play with it, but the 2/3 roadsters are actually quite unrivalled if you take my budget into consideration, and there second car is enough for me to talk about the driver.