I just ran 3 two minute tests using nothing but HA + Mages' Wrath + Power Surge and my average DPS is 4.5k. I have 38.2k Magicka, my spell damage (if staff doesn't use weapon damage stat) is 2156 and my spell crit is 48.2% (I see quite a few crit hits).
4.5k dps. This is ridiculous.
No wonder I keep dying. I'm hitting as hard as a fly into a window.