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Shaman. You want 5 in a raid.
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Feral Druid Tank. Seem to be in high demand as most are either bad or just want to play 100% cat and a raid would optimaly like 2 feral tanks and 1 paladin as their choice of tanks.
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Warlock. Because they are great and you want 2-3 in a raid atleast.
I would put hunter there too but everyone and their mother has a hunter nowdays. Same with Warrior, everyone seem to be playing warrior.
Playing rogue while not having frienbdsand a guaranteed raidspot is basicly just griefing your self.