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Well even with three classes there are plenty of customization options between them, especially the Mage. However I'm not sure if you will be able to grab most or all the skills by the time you finish the dungeon, so it could be limiting based on just how many skill points you can get.
http://boards.gamefaqs.com/gfaqs/genmessage.php?board=914653&topic=21190732 Check that out!