What Sivir skin should I get?

I really like Sivir and I have narrowed down the skins I would like for her to these:

https://www.youtube.com/watch?v=pImhJtRFonc

Snow day Sivir is my favorite, however it is only during snowdown. How much does it cost btw and is it worth waiting?

https://www.youtube.com/watch?v=94iis3siiZQ

Sharp, clean, and cool. I like Warden Sivir, but it has ALOT of white.

https://www.youtube.com/watch?v=lwMdzDfwZdQ

Kinda unclean. cool disc. Kinda a meh skin