Those are the only two colors I would consider for the Z. As much as I love my current Gun Metallic, I feel as it doesn't stand out as much as white would. I was looking at some of the white Z's here on the forums and they just look great. Nissan's Pearl white is such a pretty color.
Don't get me wrong I love the Gun metal as I did purchase it initially, but after debating to get another Gun metal or White, I went with white after comparing them for a while. Also on the 2013 will have red brakes and the LED's in the front, which I think will look awesome on the white no doubt. It's up to you, both great colors, you won't be disappointed with either. I personally think these are the best two colors. If you choose white you get it a few months earlier which is even better. Good luck!
