David, I think if you want to change rim, might was well change other design than your current one. Since you are changing anyway, might as well get a new look
But of course, if you like the look of your car+rims now (SSR Type C - which I love it also) just get the 17" SSR Type-C back :)
Understand that the tire price difference between 17" and 18", pickup maybe a bit slower but your handling and gripping wise is better ;)
Regarding the rim Advan RZ I mentioned earlier. Check out this link to view it:
http://www.rhdjapan.com/jdm-low/Yokohama-Advan-Racing-RZ-Wheels-53362
Think it would suits your car, since your front brake got the huge Brembo caliper
Lets see what other members would suggest, because there are always a lot of nice rims out there
