My experience is just the opposite. Playing just one class doesn't excite me - I have lots of teams and have no more than 2 of any class in any of them. (I have two shammies in 3 of my 5-box teams but I have to at least play them as different specs).
Oh, and as for how many? No question in my mind - go TEN!
(or if you are a halfway normal human being, 5 is fine)
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