i've been rushing people in a full game with a frozen orb + fireball sorceress and it was my first time ever. In the past, i was doing hell with a hammerdin but i didn't feel like spending that much this season.
I have been really surprised how well that sorceress was clearing all the content! You can manage to do that with a fairly poor gear except for mercenary, he has to wear a good ethereal weapon to finish cold/fire immune. (sometimes one at council and often venom lord seal or lord de seis)
My sorceress wasn't using any skillers or torch or anni... Yes she had the Tal set but with poor gear and only with 1 friend in your game, i'm pretty sure you can handle this quite easily!
Let us know if you have other question about it.