As long as you can sustain, go for it.
If you cannot, i'd drop willpower and go 5pc alteration or desert rose (jewelry 2 waist/hands body). After that you can still run kagrenacs or switch to seducer/julianos if crafting sets are more of your thing.
Edit: Excuse me but I thought you were talking about MagDK for a second, DR/AM still great for them(magplar). Transmutation/Kagrenacs/Troll king is better, especially for a group. Easy 2 get as well.