That level is fairly easy. Just hoard any fire resistence stuff you find early in the game. Evan a junk ring can help a lot.
Amazon with decoy helps a lot. Immolation arrow with decoy is a nice high damage pack killer.
Paladin with a high blocking shield helps. I take high blocking over defense rating unless it's a huge difference. Holy Freeze and charge are both a couple of very useful kills that help there.
Theese are the classes I play heavily. I haven't played the others enough to offer good advice on them. Try
www.diabloii.net and visit the strategy forums.
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Unofficial Blizzard and Hardware Tech Support.
www.opentechsupport.net/forums