the orange seats are really nice looking.... but if i you are gonna go aftermarket... get RED!!! like the red in the m3 or s2ks.

 

It should be the trademark colour combo for the Z. I have Super Black with burnt orange on my performance and it looks amazing!!!! I too was going to go with silver with Charcoal leather and I'm glad I didn't. The burnt orange really boosts the look of, im my opinion, a pretty common looking interior!

Go for it!