Quicksilver and Scarlet Witch appearing in Avengers 2, who would you cast?

 
Joss Whedon had a few surprises when he sat down in an interview earlier this week with IGN. Two new characters have been confirmed, Scarlet Witch and Quicksilver.
 
We still don’t know who will be cast in the two iconic roles from the famed Marvel series, but fans will be eager to find out this summer as production moves further along. Both characters will appear in the sequel when it premiers. Marvel fans are sure to know that both characters were each other’s sibling. The duo appeared in X-MEN way back in 1964 and have been steady characters in the Avengers line as well. Thanos will also be making an appearance in the film, much to the delight of fans.
 
We will keep you updated on the casting, but who would you pick for such important roles? It’s a tough decision, and one that won’t be made easily. (we hope)