History is more important than Heritage.
Only 75 yellow GTs were produced in 2006. The original GT40 show car was yellow. In the abstract, nobody want's a faggoty ass yellow car so very few Ford dealers ordered them. In the flesh however, they are very attractive and draw a lot of attention. The few yellow GTs that exist sell at a premium to most other GT colors. Although Heritage GTs bring the most money, they are twice as common as yellow GTs.
I did not want a yellow GT.......until I saw one. Then, no other color would do. Tim Cantwell and FlorIdaho Chris did not want a yellow GT.......until they followed my yellow GT to Rally II. Now they both have one.
But if you want the most valuable GT you can own, buy any color and drive it a lot. Take it to the track. Run it at the Mile. Explore the upper reaches of its capabilities and drive it in a manner that you would not allow anyone else to drive it. After a couple years, the intense experiences you have shared with her will make your GT priceless to you. When you see the look in the eyes of an old race car driver who gets behind the wheel of an automobile he raced many, many years ago, you'll understand. To that driver, the car he pushed to the limit, risked his life in, and succeeded, or failed in, holds a special significance. Other examples may have lower miles or be in better condition, but they lack the most important component that makes a car valuable to a man. A shared history.
At least, that's my take on it.
Chip