Uber Bosses

Alright fellas, now I need some of your help. I finally decided to look up what the keys, etc. were all about, because quite frankly, I want one of those nifty +3 skills charms!

So I did a shit load of Countess, Summoner, and Nihk runs yesterday, and ended up getting 2 sets of keys. I transmuted the first set, by myself, and got Lilith. Holy shit, she was tough, but I was able to beat her once I got rid of her minions that were around her. I have a Zealot, with a lot of damage and a shit load of life leech, so it wasn't much of a problem. I died a few times, but not that big of a deal. However, if just one boss was that hard, I'm really worried about the other ubers. I hear Uber Izual isn't a problem, but Uber Duriel is a bastard. He has holy freeze aura right? (I really need to get a couple Raven Frosts....)

Who plays on USEast that would be able to help me out with the Uber Bosses? Apparently, there are a million minions with resistances, and you need a well balanced team effort to beat them. Any tips, tricks, or helpful words of wisdom you can give me?