I'm not your complexion but if you have an Ulta or RiteAid near you buy from there because they have a make up return policy. I would suggest buying the color that you think you are and the one lighter. AND often times the stores only carry the "popular" colors. I have found in larger drugstores that there are colors in between the one I wear and the darker color and I never knew that and I have been using this line for years. I think Revlon.com shows all of the colors they offer.
So to reiterate, only buy it from a place that accepts returns or wait until it's on sale because it always is somewhere (check Target too.)