Just my idea as to how the cast should be done, take it as you will...
Gerald Butler as thor
Or Karl Urban, either'd be good.
For the possible love intrests
Lady Sif- Kerri Russel
Valkre- Diane Kruger
Jane Foster- Paula Patton
Villains
Crispen Glover as Loki
Ali Larter- Enchantress
Nathen jones as her lacky Exacutioner
Hugo weaving as the voice of Surtur or Ymir
And John Rhys Davies as Odin
"