I'd say it depends.

If your goal is to resell the car -- and you want to maximize your selling price --I'd consider buying a more conventional color. This provides your with a larger market. This is not to say you won't find someone who loves Ruby Red and will pay a premium when you're ready to sell, but that's not a likely outcome. Just make sure whatever conventional color you pick you like.

For example, when I bought my '10 GT3, I knew I'd sell it within the year. I chose white to help ensure the largest market. I also chose Ceramics for the same reason. Turns out I liked white (though not my first choice) and ended up loving the Ceramics.

But if you're going to keep your car for a long time, I'd say make sure it meets as many of your must-haves and nice-to-haves as possible. As others have said -- don't worry about resale in this situation.