[The DarkOne]

As a fellow swede my guess is that you won't have to worry about import tax at all.
I didn't need to pay any nasty import tax when i bought it from shrapnel games net shop when the game was first released. I think it's because they sent it as an ordinary mail and not a package.
Of course there is never any guarantee so i'd still suggest to plan for the worst and hope for the best.