Hi
Knight!
I agree that Jack Black would be the wrong choice. I think that he's a very intelligent, very funny man (he reminds me of the guys I hung out with in college), but I can't see him as Bilbo. I'm always up to being pleasantly surprised, but I think that this would be a disaster of Anakin Skywalker-sized proportions.
I love Michael C. Hall. He's a hilarious, brave actor and he has amazing range, and "Six Feet Under" was glorious. I'm not entirely sure that he can "carry" a vehicle like this - something that has nothing to do with his talent and looks, and everything to do with the way the big-budget marketing world works.
I'm sure that they will choose someone young, and devilishly cute, to play Bilbo. I can only hope that they will choose someone young, devilishly cute, and extremely talented. Which is why I hope they'd go for someone like McAvoy. Or an unknown dude.