OH I hate those lightning souls! God they own me. Even though my lightning resist is maxed. Well if your going to mainly stick to meph runs, I'd suggest a fireball sorc, IF your going to moat Meph in order to kill or if your using a bot. Otherwise I'd suggest orb/nova.
Whats your accnt name? I have a pally mf ammy I've been saving for just the occasion, it's got +1 to skills plus like 25% mf or something, I'd use it if i had mf pally.