Fan Casting Characters from Robert's Rebellion

So for strictly academic reasoning who would you cast for people from Robert's Rebellion?  And how would they differ from who has been shown on the show?

Characters Recasted

Ned Stark
Lyanna Stark
Howland Reed
Aerys Targaryen
Arthur Dayne
Gerold Hightower
Rickard Stark

Characters yet to be cast

Rhaegar Targaryen
Elia Martell
Ashara Dayne
Brandon Stark
Robert Barathoen
Jon Arryen

And any are welcome to add other characters if you think anymore will be added.