I thought a few things for the upcoming movies like;
Tanya - Taylor Swift (I know she is a singer but I've seen her act a little and she is soo beautiful and like rock, i guess. So she would be a perfect vampire)
Garrett - Drew Fuller ( It just came)
Renesmee 6-9years - Adair Tishler(Cause she is soo sweet and more like renesmee to me. But there is a fact that she'll be grown till breaking dawn)
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oh, and I wish that bella was played by Leighton Meester.
She would have been a much better Bella, cause she has bigger brown eyes!! But I hope she plays Renesmee's grown-up version!