I can suggest trying Wraith/Geist for the extremely character-driven game that it always generates.
My players were hesitant at first, but they've ended up having a blast. Right now they are trying to protect a mutual anchor (Which I feel is a necessity for any good party dynamic in Wraith)
If you're interested, I can provide you with the modifications I made to the Geist manifestations, and some of the rules for how ghosts interact with the world. They ended up being relatively easy to follow, but I have been doling them out to my players as they come up. This has the interesting effect of creating more suspense. They don't know what will hurt a ghost exactly, or what they are capable of beyond the powers they picked out.
It's also the longest Ive gone without running a real "combat" in a game. Two full sessions, and aside from a single swipe by one PC at another, combat has been nonexistent. (Though i think that might change next game)
EDIT: Also, you neglected Wraith in the title of this post.
I suggest "A Ghost of the Trail Called Ctulhu Itself".