I'll post some pics. I'm going with zeptron's choice as my 1st choice.
I think Kate Beckensale is a good choice too & is more well known, which Thor may need.
An out of the box choice. Maybe better as wonder woman: Morena Baccarin
I haven't seen Rebecca Hall act. So I don't know. She has a good look though.
P.S. If Thor is young, we may need 18-22 year old actresses. But I can't hink of many young chicks.