If you going to build a car purely to resell then the more personal and different you make it in terms of colour scheme the narrower your market becomes. As Dove says, red is the most popular colour and will appeal to, on average, more people. Not going to get into an arguement over signature colours (Red vs Yellow, Mick
) but when most people think Ferrari, they think red. Remember these are specialist cars and don't necessarily appeal the the everyday punter. So there are less people in your market to start with. However if you are building a car purely to enjoy for yourself than you plan to keep for a good while then of course you do what ever you want.
. Good luck and if you go down the build route, it is the law that you do a build diary on this forum with PLENTY of pictures!