Haunted woods stamp collector. I also love the snowy valley and faerie land ones but I'm two stamps away from snowy and about 5-6 away from faerie land
For me it's the Haunted Woods Stamp Collector, I only start to buy other stamps until I have this one.
Bilge Dice Streak is an avatar I also always wanted to have, but it seems they won't fix the game anymore. ;;