Ooh bebe the Snowdown Shop

I don't know how to put pictures into boards, but here's my Snowdown Shop:

Surprise Party Amumu : 40% off ; 1350 - 810 Guardian of the Sands Rammus : 40% off ; 975 - 585 Bloodstone Taric : 40% off ; 975 - 585 Giant Enemy Crabgot : 70% off ; 520 - 156 Cryocore Brand : 70% off ; 975 - 292 Bloodstone Lissandra : 20% off ; 975 - 780

OHHHH MANG OH MANG! But the struggle!

I'll start from the top. I have just today to decide if I should get Little Knight Amumu for 375 or Surprise Party Amumu for 810. I very recently bought Chrome Rammus for I believe 260 since it was on sale. Bloodstone Taric is going on sale next month for 50% off so it's not worth it. MUST GET 156 RP SKIN! MUST GET 292 RP SKIN! I don't even know why Lissandra is even here; I barely play her.

I find myself very happy about my snowdown shop. Not a single duplicate champion and TWO 70% off skins. If it weren't for future sales and skins I just recently bought, I'd have bought out (almost) the whole shop! But my one qestion is...