Heya Dino,
I've been pondering this very question for quite some time. I had to order my Z and it's due to arrive next week. But after looking at many many photos of the 370, i feel these are the best looking rims for a black Z (IMHO):
Venaci Spirits:
This is photoshopped black:
Volk TE37's (also photoshopped black except for this 1st pic):