Its still a buyers market, you don't have to accept what your dealer has on their lot. Tell the dealer what color and features you decide on and what you have to offer $$ and they can work with you. Any dealer can get another color/model Fit from another near by dealer.
As for colors, all the details mentioned above are very good points to consider. It just depends where you live, what color cars you had before and basically colors you like. I've had white, black, silver and red before so this time around I went with a fun color, the Orange Rev and have been enjoying it so far.
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