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My LGS is about to start a campaign but we are limited to using two books for army purposes, including WDs, dataslates and FW books (so if I wanted to use a vulture gunship with my guard army my two books would be the AM codex and the IA book for the FW unit.) Each week, each player can challenge another to a game and the challenged player gets to choose either 800pts (one detachment), 1500 (battleforged), or 1850 (unbound allowed). Im just not sure which books to choose. I play;

Imperial knight - I have the three original cerastus variants plus a paladin and crusader
SKittari - Pretty much everything
CultMech - pretty much everything
Guard - pretty much everything in limited quantities, not a lot to spam besides LRs and infantry, one wyvern

I also have space wolves and marines but I don't really want to play them.

Which books should I pick? I've really been trying to get more games in with my knights but im not sure what to use with it or if it's the right decision to go with night at these points levels.

I would either do Knights with IG Allies or Skitaari + Cult Mechanicus.