I think that color is of lessor importance to the 914 buying equation than the electrical, mechanical, running gear, and lack of rust.
If such a car comes around in the color you want, then get it. If not, and the other things are up to snuff, get it anyway and have it painted to a color you like. After all it is your car. You have to live with it. As Dave said, resale value is only important when you sell the car.
I purchased mine because it was virtually rust free and had lots of upgraded features (rebuilt engine, koni shocks, SS heat exchanger, etc). It was a very oxidized Olympic Blue that had to be repainted anyway. So I took the opportunity to have it professionally painted a color that I liked. It wasn't cheap, it's not an original Porsche color, but it looks good, gets lots of comments, and I've had several offers to buy it.
I'm happy, it's my car, it's unique. After I'm dead and my wife wants to sell it, let the other guy worry about the color.
