Another Ghost fan here. That's been a favorite since I was 6. Jotun Troll is excellent--you've got to love all the detail on that one. Also Coatlicue, Kraken, Abominable Snowman, Ganesha, Hydra (even though it's a really strange take on that monster)--pretty much all the usual suspects.
One I recently decided I like a lot is Ectoplasmic Phantom. I think that guy's underrated.
Hydra is the Christmas tree of MIMP, and is a great sculpt.