I ended up using the PnB amulet, still holding on to the prismatic amulet just in case.
Pretty cute drop, useless for me though.

Fanaticism + Might


Found this as well:

This is pretty much the best possible prismatic suffix I could hope to cube (other than 10% FCR, which I don't know if I'll end up needing or not) so I'll hold on to this and stop cubing amulets. From now on my P gems will go towards rerolling charms.
Speaking of FCR, my plan is to use White (20%), Spirit Monarch (35%), and either ring + amulet or ring + ring to bring me up to 75%. Obviously Trang's gloves would work as well but I don't plan on doing any MF runs on this character. I've been spending all my extra gold gambling rings hoping to get one with FCR and other good mods but I haven't had any luck so far.