Hi I have the same car, I like my active sport, even though it looks like a sporting lol, anyways, yes go with 17's goos choice, I personally like OEM styling so a set of T-Jet or M-Jet alloys look nice, maybe the Abarth or 2 tone alloys also look nice. Id have them in MATT black to suit your contrast of limo tints.
Get it lowered when you change the alloys to bigger ones or, as I have now, a large gap from the arch to the tyre
but will soon be changed. If lowering go for Eibach Sportlines unless you can get coilys!
Other small ideas like the vinyl behind the front number plate, search this. Cupra R splitter looks good to, from SEAT.
Anymore ideas search the forum, and in members motors, Col has a nice red sporting you could take a look at.
Hope this helps