Either works very well - I think Stanton gets my vote, though. I really do like Tom Skerritt, but I just don't get the feel of him matching Frank Wang.
Dame Dench & Ms. Falnagan both present too old - Stockard Channing is a much better age-match. I really need to go through and make notes on physical cues we're given.
Faye, again, I think is too old. Remember - Ish was a Captain in his 40s, and it wasn't that unusual. Kim Cattrall is excellent, though.
I vote Kiefer Sutherland here. While he can do a wonderfully upright person, he does have a good bit of smarm in his look. DiCaprio doesn't have the right feel to my tastes.
Gordon-Levitt, for sure. And a damn good choice he is, I think!
I'm going to go with Carbonell, here, because looking at Glover, I think he'd do a *WONDERFUL* job as Francis the environmental tech - he's got that go-and-do-it kinda scientist look, kinda like Indiana Jones.