Just once I would like to see a portrayal of the vikings that breaks away from the stereotypes and tries to show them as what they seem to have actually been. Trouble is, if you do that odds are people actually won't recognise them as vikings.
I am having a little trouble merging the two images you describe. On one hand they are described as very clean and friendly to outsiders with a great reputation as merchants while on the other hand they were violent raiders. What were their motives for all the raiding and how did people accept them as merchants knowing that they next day they show up it could be as raiders?