This was definitely a 'best fit' decision. Number one sounded... unnatural. And he has no change in tone whether narrating or talking to the Goddess of Moe. Definitely not like Kyon.
Number two sounds as close to what I'd imagine Kyon in English as we're gonna get. Although he still sounds bored even in Asahina's invigorating presence, at least there's a change in inflection.
Number three sounds inappropriately bored and slightly drunk.
Number four, I think, is also one of the choices we got for Ituski. Also a bit of overacting.
I think I remember number five from the History channel
So, yeah... I voted for number two.