I changed my build from a Paladin using Zeal and Fanaticism (Zealot) to one using Blessed Hammer and Concentration (Hammerdin).
I am presently at Act 5 Quest 3 in Nightmare but I find myself dying frequently while navigating the Crystaline Passage/Frozen River.
Certainly the narrow halls are a problem, but opponents which were a minor annoyance with the Zealot built are now a major problem, specifically Ghosts and any mana burn creature.
My equipment is not yet tuned to adding faster cast rate (fcr) or mana, but I did add a 20% mana regen ring that is helping.
I am trying to use hit and run in the tunnels, but to very limited success. Since I've seen this character wipe out the Chaos Sanctuary with very little effort (but struggle with Diablo) I'm not ready to give up on the build and reroll, but I could use some ideas on getting by.
The char is currently 75 on all resists, 1850+ BH damage, 897 def (2k+ with Holy Shield), 745 life, 235 mana. I'm using a Sureshrill Frost Flanged Mace mostly for the "Cannot be Frozen", Spirit RW Akaran Targe and Trang-Oul's Claws. The other items are mostly there for defence bonuses or resists.
I'm playing player versus monster only (PVM) on the current ladder.