For people who are well known:
Sean Connery, as the bad guy.
Hugh Jackman, GB
Will Smith, GB
That girl who played Jean Grey in the X-Men films, damsel in distress or GB
Patrick Stewart <insert role here>
Morgan Freeman <insert role here>
that kid who played Spider-man, GB
Jim Belushi, Blues Brother
John Goodman, Blues Brother
A good red-headed actor (I don't like blondes) role depends on the actor
Personally, I think they should go for unknowns for the new team, with the old team acting as mentors. With well known stars, you get drawing power, but you also run the risk of having a movie revolve around those stars. The reason I placed the Blues Brothers in, is because I'd like to see the band make a cameo in a GB movie, maybe be playing a gig when some ghosts pop up, and the GB's come and bust it, then have an all night jam session. So long as B.B. is there, that could go on for the rest of the movie. I'd want the entire original cast if possible, but acting in smaller roles. Essitially like Patrick Stewart in Xmen, he alone has the drawing power to take the movie, yet he played a role which limited him to a wheelchair, and allowed the others, mostly unknowns, to flourish. Though he could have used an astral form to help; that wouldn't have been fair, with the overwhelming power of Wolverine's fanboys, Magneto never stood a chance. And I agree, that the worst thing for any form of plot is to have Political Correctedness. It only makes it biased towards minorities and women, which is no better than being biased towards whites and men.