Ghost types are my favorite types. If I wanted to make an all ghost team, and compete at least semi-decently, who would I use?

So far, I want to use Doublade/Aegislash, MegaGengar, and Chandelure.

I've considered Rotom, Golurk, Jellicent, Driftblim, Spiritomb, Gourgiest, Maybe even Shedinja, Sableye or Frostlass.

I probably won't use a pure ghost type because being a themed team, I'll need all the coverage I can get.

Who would you use if you were making an all ghost team? Why?