barbarian 1st to checkout the game. whit a easy char. as a barbarian it shouldn't be that hard.
after i get to know the game i probably go for the demon hunter or witch docter. the wizard could be also but after playing a basic char. like a barbarian, i don't think i want to play another basic magic char. monk.... no thx.
I will probly play as the Demon Hunter or the Barbarian cause I don't like playing a monk and there are few games where I'm good with a weapon that isn't fit for close combat, like magic.