as Arcane mage, i have this combo i usually use with hunters:
fireball + arcane barrage (if i get opening shots, that is) i double tap arcane barrage, which you can do, and lays down at minimum, 550 dmg.
blink the range difference. (no way you'll kick him in ranged after your opening shots), frostnova. herbhaste, frostball+arcane barrage again, (the tricky part is making sure you get behind him, alot of hunters has NO idea how to counter a squishy clothie in melee, and therefore will do keyturn (where you turn around with the 'D' or 'A' key,) instead of wheels. this will work well with most hunters, since the trick is, don't let him get any spells in on you.. and for the love of god, just give up on the idea of sheeping :\