Kevin,
The front wheels would better fit the 350Z and G35 coupe than your 370Z. We recommend the 19x9.5 +30 GTS for the front of the 370Z, for optimal fitment. The 19x10.5 +18 rear fits nicely though.
Here are some pictures of our GTS setup, with the specs that we recommend:
Injected Performance's White 370Z Sport!