6UL 17x8
https://949racing.com/17x8-6UL-5Lug.aspx
Pick up a common 225 summer tire and have fun.
I love my 17x9 RPF1's, but I know a lot of people want to be 'different'
Skip the turbo kit and just buy the Cayman
Edit: I like Motegi's too, I think they have one or two 17x8's that'll work.