Ozzy Osbourne
Clint Eastwood
Jaclyn Smith
David Lee Roth
Betty White
Pierce Bronsan
Linda Hamilton
Cameron Diaz
Jean Gilpin
Ursula Andress
themikefest

Laura Bailey always. She was great as Lieutenant Kurin every third NPC you meet in ME3.
Fixed 
WHHHHAAAT?
I think it's the boy from Shep's nightmares. But I can't find who voiced him 
Producer's kid.
Can't believe I didn't think of it before. It explains so much.
Otherwise, here's who'd make me flip my **** and preorder if they were starring:
Bill Nighy- preferably villainous role
Stephen Dillane
The entire cast of Archer
Christopher Walken
And for lulz:
Seth McFarlane
Nicolas Cage
This last one needs a picture:

Feeeel itttttt! 