Which skin should i get? i can't decide.

I recently duo'd with a friend who was on promo to platinum. We won and he fianlly made it to platinum before season ends, and he was so happy on how i played that he decided to gift me any skin from the price range 975 downwards. I declined at first but he kept insisting. Now i can't decide which skin i get.

The champions for whom i'd like a skin for that i play as well are: JarvanIV, Shyvana, Renekton, Riven, and Twisted Fate. Please help me decide =(.

EDIT: my most played champion is Jarvan IV, but i feel like his skins are bad except for warring kingdoms but that's over the price range.