Those 17s are called "Boxster S IIs" and they will fit your car well (I own 3 sets
). I am not a bling guy so I like the fact that they fit well, look decent, clean up easily, are strong and light weight, and a $150 tire costs $150 instead of $400 ea. as quality 19" tires often do... if you can find them.
Not a fan of 19" wheels on a Boxster. Heavy, make the car slow, easily bent, expensive rubber and just look like wagon wheels.
Caveat: Just one guys opinion here and others will surely disagree. Ultimately it is your car and you are the only one you need to please.