Colour inserts on the seat, ally pedals, cheap 16" rims, 0.1L that is hard to pick in the car, suspension is already fine on the non sport, for a premium of $8k? Thats 50% of the std car price... $2k for the airbags in the S is worth it. The only really useful thing is the ESP, but its Front WD, doesnt need it. Better off with the S, spend $1500 rims, $200 tint, spend the rest on drugs and hookers.
*edit*
Heres a link of our S, has tint now tho. Very glad we didnt waste money on a Sport.
http://www.amnet.net.au/~wrx/swift/swift%20004.jpg
Also, i wouldnt change the ratios on the standard swift for the world. Theyre pretty much perfect. 100kmh = 2800rpm. 110 will sit u on 3krpm. The "power bands" for the other gears are spot on too. End of the day its still a NA shopping cart, but it does it well.