www.worldofwarcrafts.org Wow Gold Forum

I very rarely ask questions regarding endgame, since I'm under the impression of "don't ask a question until you know a little bit about it"...but my curiosity is to strong today. After reading several threads today regarding end game raids, and valuable classes, I'm left with a feeling that I've under estimated the value of class selection and corresponding spec selection. For those that raid frequently, what is the most valuable class to have in your group (including their spec)? Is it fair to say that once you reach 70, and are fairly geared up, some classes are almost always going to be favoured to have in a raid than others? Or in the end, are all classes and speccs needed equally? I'm hesitant to ask this question because I know so little about end game content, and I'm sure there are tons of underlying factors...perhaps not!