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Halflings make the best rogues. Elves are a close second. Of course, a scout, spellthief, ninja, factotum, or lurker could work too. The main reasons to have a rogue are to have someone for trapfinding and to have someone with a varied enough skill list to be able to handle a variety of situations. I don't think it will matter much though. Play something you think would be interesting.
Since your healer had to back out I would like to join. I was thinking human cleric of no particular god using the trickery and luck domains. Essentially a cleric who believes in the simple essence of 'Luck.' Why not be spiritual and love gambling all at the same time?
EDIT: Nevermind, didn't see that the recruiting had ended before.