Wheel size?

What size should i get for the Wheels (http://www.cardomain.com/ride/783604/1) on my site originaly i was thinking 18" but because they are not chrome i was thinking they might look stupid if they where too big so maybe 17"? what do you guys think?

18s or 19s

17 are way too small

where did you find the borla cat back kit? i cant seem to find 1
John

www.summitracing.com has one but its for the grand am but since they are both n body cars it should work