HarryFrom the pole list the only one I like is
Hugh Jackman. One of my all time favorite actors. However, he's a little too buff and good-looking for our beanpole wizard hero. Also, Jackman would be be a little old for Storm Front. A Young Jackman, maybe, he's still too pretty though.
Off list I always imagined Dresden to look something like
David Tennant, only taller and with darker hair. However, Tennant's voice isn't right and even though Tennent is a very talented actor with all the right attitude, he can't pull off a very good American accent, or at least so I've heard.
In the end I think
Alexis Denisof would be best. He looks the right amount of skinny and scruffy and if WoJ is that Jim likes him as Harry, then Denisof sounds like a good choice to me.
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I do
not like Fillion as Dresden. He's way too old, is face doesn't have the sharpness of Harry's face, he's too charming/cute. And personally I don't think he can pull off dramatic acting very well. With comedy he's great. He could do the jokes, but I can't see him pulling off the sacrifice and angst Harry goes through. Besides his eyes aren't even the right color.
I also don't like Padalecki. He's too pretty and broad-shouldered. His face has a soft, almost boyish quality, even when he's trying to go scruffy and that's just not the way Dresden is described at all. I can maybe see Padalecki as Thomas, but not Harry.