Who would be a good Ian?

I really like Matt Dallas for Ian. Ian is described as tall (one of the tallest in the group), fair, around 25 years old (stated por Meyer's in an interview) with black hair and vivid blue eyes. While Matt Dallas doesn't have "vivid blue eyes" that can be easily fixed with contacts.

I don't really understand why everyone says Ian Somerhalder. He barely matches Ian's description. Yes, Somerhalder has the right eyes, but he's not very fair, a little old, only 5'9 and his hair is dirty blond. I really don't see Stephenie Meyer allowing the whole hair-dying drama to happen again like it did on the Twilight set. Also, Somerhalder has too much of a bad boy look/mentality. In the novel I never saw Ian portrayed as the bad-boy-turned-good-guy. I know, I know.. he did help attack Melanie/Wanderer in the beginning, but that appeared to be mais about survival and fear than his personality. Ian always acted mais like the sweet, smart boy-next-door type.