Magneto the movie?

X-MEN`s MAGNETO to be spun off
A "Wolverine" movie seemed fairly obvious, and in fact 20th Century Fox is developing a WOlvie film in addition to "X-Men 3." BUt now comes word they are also proposing a "Magneto" movie.

The suggested story will focus on the (future) mutant villain's early years, starting where the prologue to the first "X-Men" movie left off. So it's likely we will see younger actors playing Magneto and Charles Xavier instead of Sir Ian McKellan and Patrick Stewart.

McKellan and Stewart are heavyweights. What younger actors could possibly follow in their footsteps?