Splurging with Holiday Donuts

I bought most of the premium stuff already, I don't have Luann, Miss Springfield, Pet shop, K9 Officer *is he worth it?*, Kamp Krusty, Film Set, Lugash, Coliseum and the Vulcano Lair...

I'll buy Luann when I got Kirk, his quest didn't come up yet...
So what is the best premium to buy? Kamp Krusty and Film Set are just extra skins, so I find that rather expansive..