You know.... it's not really that bad. But all the nismo stickers on a base Z with sport wheels have got to go. It's just too much. You're making your car try to hard to get attention. Let the natural lines of the car speak for itself.
That being said, if you want to ignore everyone's advice and make your car even more noticable there's a good chance I'll be selling my wheels soon. I got some new ones in and am just waiting for the tires. They'd certainly compliment the theme you have going now. I'd plan to keep them as track wheels but they can be yours if the price is right.