If you really want to make a change, I think something with a black center will give a nice contrast and complement the trim pieces. I agree that the current setup looks great as is however.

 

It's really a personal preference. For me, I like your current one better as it has a cleaner and classic look.

 

Definitely one of the nicest wheels and setups.

I wouldn't change them at all. Or for someone who wants your old rims lucky them if you sell it.

Cayman's are super lucky that they can fit a set of 20's without any rubbing issues.

Good luck with your decision.