Which dupes to sell?

[Kardas]

So I used 30 Xmas souls last night, and I didn't get Coalgiver Eddie. I did however, get a dupe Corrupt General, dupe Visions Eddie, dupe Angel of Fear and a dupe Sentinel Pyro Soldier. I did at least get 1-2 of every other Xmas toon, and my first ever Assassin Golden Son. Buying 20 Warrior Rare Souls in a last ditch attempt only netted my first Rocket Dog and another Wicker Man.

Sigh

Problem is now, I don't know what to sell anymore and are at 125/125. Other than selling a 2* Desert Guardian and an Ox Cultist and Undead Guardian I used in the early days, I don't know what I should sell for inventory space.

I've kept all my Rare GA dupes in the hope that I can use them again when Sacrifice finally shows up, as well as dupe Xmas toons and Pumpkins, because I hope that they'll be worth more than say a Corrupt Owl Cultist, for instance. Or should I start selling the 3* characters that I'll never use?

EDIT: And one miscellaneous question: I want to make a poll thread, but despite clicking the option to add a poll I can't see where I can put the poll options. Am I missing something?