I understand the appeal of a good engine, but to be fair, I never really get why people buy performance cabs, if it had a roof it would probs be a better drivers car, don't get me wrong, I love cabs, although you do look a tool, I have an mk1 mx5, i only use it to go for a drive, summers evening roof off, chills me out. On topic I agree not many 6 cylinder cabs, z4 for me from your list, loads for 15k