Vinnie Jones played Juggernaut already. I wouldn't be averse to him reprising the role, but I am not a huge Juggernaut fan anyways.
I like Tami Farrel as Jean Grey a bit, but (and this is going to sound absurd) she may be
too pretty for the role. Grey must be classically beautiful and jealous of Emma Frost's fake-y beauty.
I don't know where you heard of Reena Franquelli, but she would be an interesting Jubilee. My sister recommended
Brenda Song who fits the Asian-American bill a little bit better...but I am now going to think of a role for Franquelli in the Marvel Universe.
Edit: On record, I am not a fan of Jubilee having more than a bit part.
-wtk