Having a good healing/damage gear is important...BUT never understimate the importance of stamina. Some encounter in karazhan damage the whole party or take 1 hit from a mob can happen sometimes an getting low hp can be an huge Handicap, ress in combat is an option with 30min Cooldown.
Try to have every piece on you have some +sta too, and get some sta enchant(the +30 sta on leggins is very good and cheap) if you lack in that!!!
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