Yeah it will be insane, 1 shot any oponent. got a rogue on you? spam arcane blast :P
Its also nice if you can find a way to macro frost nova so only 2 characters at a time use it.
So e.g. If you press "4" It does frost nova on all your characters, Shift+ 4 = Char 1 and Char 2 frost nova, ALT+ 4 = Char 3 and Char 4 frost nova etc. - I say two at a time because resist do happen, i know

Alos when your level 70, PoM pyro and massive blast waves

Good luck and hope to see some more updates!