^ Same can be said for a diamond. I agree that Color 4 is just another shade of the Alden rainbow, but exclusivity adds to its allure.
I'm with Sevenfoldtieguy in that I think Color 8 is the quintessential, most versatile shade.
Fill those in with some brown polish - I just hit my 403 with kiwi brown and was able to fill in the lighter colored scratches. Cream polish might work even better as it should have more pigmentation.
Great collection you have there, very nice.