I am biased, but I have a white car, and I think the white shows off the cars lines well. Same could likely be said for Casino and silver....... Personally, I've just never been a black car kind of guy...... I like red and blue too.......
And BTW, iron caliper cars are rare. Not many built. Someone posted a chart showing options ordered, and iron brakes were a very small percentage...... But if you searched, you could find one used. But, with the recent renewal of the $20K rebate, and the ability to not add too much carbon fiber fluff and other options, you might be able to buy a new 2018 NSX under $150K.... Good luck!!