I love my 16s on my 928. They would look great on the boxster as well. One of my 928 good buddies started a company to make specialized phone dials for Porsche cars, in 18" sizes to start. I shared this link with him, and maybe get his attention for a Boxster wheel.
Here's the link to Jim's site:
project phone dial - 928 Classics.
Here are the stock 16s on my shark (these are not Jim's wheels):
