So... skins... yay...

So I've been thinking a lot about skins while earning money for $30.00 RP Card, and I was wondering Which skin should I buy? I've already bought Guardian of the Sands Kha'Zix, Battlecast Prime Cho'Gath and Panda Teemo, and I got Unchained Alistair, Riot Girl Tristana and Dreadknight Garen for free (because I can). So I want skins for the champions I have. Right now, I have: Amummu, Annie, Ashe, Fiddlesticks, Jax, Kayle, Master Yi, Morgana, Nunu, Ryze, Sion, Sona, Tryndemere, Twisted Fate, Udyr, Warwick, Xin Zhao, and Dr. Mundo. And I'll be saving up for Evelynn, so let me know what you thing

-Peace