Best Showdown/Holiday skins available this year?

I'm not making a poll due to the choice limit being smaller than the available skins.

Which showdown/holiday skins do out of the available are the most worth getting and why? And out of the Available ones, which ones do you consider to the the "rarest"(least likely to return)?

Here is what I have: Festive Maokai(bought it a while back), Dark Candy Fiddlesticks(when it first came out), Snowstorm Sivir, and finally Snow Day Singed.

Some skins I like but some of them I don't have the champion to go with it. I am willing to buy ONE champion to get the skin(Most of the champions I don't have yet(that have available showdown skins this year) is mainly because I just haven't bought them yet). I'm also considering whether or not to just save the RP, don't buy another showdown/holiday skin and just save or use the RP I have on another skin(non legacy) that I would more likely be happy with.

So what's your opinions on this years skins?