I'm going to say that this totally depends on your understanding of the respective specs/classes. My major objection is that having fun while multiboxing pve is more important than anything: if you went for 3x the same classes and don't find it interesting at say level 74, it might be quite a task to throw all that work out of the window and start over from scratch. Whereas if you go for e.g. 3 different casters you can macro the very basic spells first as you progress through the dungeons and work from there to further optimise your setup.
If you have no clue about how most classes work, you might want to stick with a more uniform setup. If you do have some experience (read: if you are not complete garbage at the game in single player mode) there is for starters little difference between running tripple ele shamans or an ele/arcane mage/hunter as your dps.
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