Have you gone to the dealers and see the swatches?
One thing I'll say about colors is that they never look the same. What looks amazing on and overcast days looks terrible in the bright sun, or vice versa. What looks awful in the showroom looks great outside. There is no color that always looks the best IMO. Different surrounding/reflections make cars look totally different as well.
What I'd suggest doing if you can't see all the colors in person is go to YouTube and search for videos of cars in all the different colors and locations. Find as many videos as you can of the colors you like. They may not capture the pearl very well, as that is very hard to capture, but I think it gives you a very good ideas still and much better that photos.
DO NOT TRUST PHOTOS! Photos are very often either processed or exposed incorrectly. Videos don't have amazing dynamic range necessarily either, but I find that videos are much more realistic in that no processing is being done and the cameras are constantly adjusting giving you more of an average look at the car.
The one color I advise against getting, unless it's the pearl version, is white. I think you can wrap a car in white and have it look really nice, thus you always have that option. I thought about getting white, but then figured I might as well get a normal color and then I can always wrap matte white. No need to commit to white.