Thats a good question. I can see a young arnie as the barbarian. That woman who plays mystique will be a good choice for the amazon. I know hes a bit old but donald sutherland would be good as the necro. This might be corny but i think that marie holly combs could pull off a good sorceress.

I rethought my answer, the mystique woman wil be a good asassin and angelina jolie would be a hot amazon.

I know it was already basicly done.But dwayne johnson (the rock) would be a good barbarian