That group should do pretty well. Are you aiming to do any Heroics? It might be worth your while swapping out a single mage for a Warlock, if only to provide some extra off-tanking.
I'm not sure how viable a resto druid would be for heavy instance healing, I'd imagine it would do pretty well, plus you have the added versatility as well.
If you intend doing Heroics, I'd probably swap out the Druid for the Priest, however if you find you can cope quite well with the druid then keep it.
I can't really see the Hunter or the Rogue being of too much use to your instance team, so I'd probably not use them, however the Warlock and the Priest could definately be useful. One thing you have to take into consideration is how well you can synergise the team. Controlling several diffrent classes at the same time is fairly difficult to do, so sticking with a Paladin tank is definately a good move. Additionally, using a priest may be better as it probably requires less attention in order to heal effectively. 3x Mages are pretty easy to control, the only thing you might have problems with is selecting a diffrent target to CC with each mage, althoguh solultions to this have been posted up, take a look.
Good Luck :-)
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