17" wheels will dent as easily as 18" wheels, both are cast alloys and well...they dent that's what they do in NYC. On ride quality its more to do with weight.
18" Carrera five spokes are 21 pounds nearly 10 pounds lighter at each corner than the stock 18" wheels. 40 pounds of moving weight changes ride quality for sure. But even more pivotal is the weight of the tire. There is more of a diff. with a light tire and heavy wheel than with a light wheel and heavy tire.
Green and Black sounds very nice. I saw a nice 911 in that scheme with polished mesh wheels. Real head turner.
I'm not as crazy abot green and tan, elegant vs. sport I guess.
Green and red would be interesting, saw a Lotus Elise like that once, I think.
p.s.
How much more in this neck of the woods is the 3.4 option?
p.s.s.
ALL P-Cars should have front and rear badges its blasphemy to do othewise.
I think it would be cool if you became the first guy to have a 987 badge on your
Boxster. On dark green I think a silver or gun metal badge would look nice and a silver hood crest up front. Bumperplugs.com sells that stuff and some cool interior mods too. Maybe you could get a green and black thing going like they did with this yellow/black:
