^ I don't see how that really matters, since OP said they said they liked the color they saw in the picture, not that they thought that whatever color the wig actually is might be nice.
I think the 27 is the closest to what's in the picture, though slightly darker. Arda has a Spanish Brown color that I think would work, and Epic Cosplay's Light Brown is even closer. If you're wanting to stick with Amphigory, though, I think 27 is best. :3
Conventions for 2015 (so far...): Momocon, A-Kon, Otakuthon, Sac Anime
Cosplay line-up: Mayoi Hachikuji (Bakemonogatari), Nona (Death Parade), Nagisa Momoe (Madoka Magica), Menma (AnoHana), Tsukihi Araragi (Bakemonogatari)