Remember, the actor can't be too tall. He has to look small against the Dwarf actors, just like how in LOTR John-Rhys Davies was a lot bigger than the hobbit cast.
James Maclvoy would seem a popular choice . I was dead set against Elijah Wood as Frodo and see how that turned out- inspired. Well hopefully not long to wait now. I expect we will all be on saying ETF- Him!!!!!.