If you plan on stupidly running your priests into combat, then a PW is the best option. A fist means attacking last and since your IC is in base-base contact he can be singled out.
I have been running my priests vanilla, or with a ranged weapon and keeping them in the back of the assault so he doesn't get into combat. He is just there to provide the bubble.
My Sgts get Fists in every squad unless they are with an HQ who hits hard enough.