In 2010 (or 2011, can't remember), white dethroned silver and became the most popular color for new cars. White with black accents is really "in" right now, and there's a reason or it, it looks damn clean:
When I bought my 350z, I had a hard time choosing between black and white but ended up going with black because I believe white doesn't look as good out of the box. Silver wheels, and those silver door handles on a white 350z just didn't look quite right. Put some black wheels and tint the windows, then white looks a lot better, but I didn't want to go through that trouble.
Anyway, these are all my crazy opinions, in the end the 370z will look good in either color. Good luck!