agreed.  Purge magic could be pretty destructive so it's always good to have backups.
I saw a game where a wizard just kept running away from the warlock... kinda hilarious.  Also i feel Purify is a must have.  Gorgon Archers can completely ruin your day otherwise.  This has made me wonder if a Priestess might actually be a better equipment build.

As far as the teleport wand goes I don't think it's necessary.  Instead give yourself cheetah speed and mongoose agility.  Now you're elusive and fast.  You can chase around another mage all day and not only are you not hindered now but you can attack the enemy mage straight through guards.  This also frees up your shield slot so you can just use an elemental wand and shoot extra damage at them every turn.  Yeah teleport wand can move the enemies around too but why sac the extra damage for something so trivial when they're looking down the face of at least 4 armor and Helm of fear/Deflection bracers?
Last time I played this build I watched the priestess go through most of her tricks before the player just conceded from a lack of ability to do anything about the one man army.