I stopped my 2hw guy at 50 MjE, 75 MnE, 50 Wz. If you need to use Mana Leech you probably want to get a lot more MjE, but I've never found it necessary. I was tempted to cut Wz to 25 ranks but the loss of DS and TD scared me. In that regard, it's likely worthwhile to get Wz to 100, though it would push spell training over 2x and pretty heavily impact the pre-cap training point budget.