Me personally I'm not a big fan of roadsters/convertibles. I always notice performance reductions from there coupe counterparts and I rather have performance than people seeing me in my car. That being said the boxster would be an out and the 370z lives.
Though when mentioning the cayman, especially the cayman S, I might be persuaded to go that route mainly based on the fact the cayman is much smaller and lighter making it more agile if not faster. BUT THE z is an uncompromising value and I would be more attracted to the less refined more rambunctious VQ37HR. So the 370z wins again.
