I know that most people would disagree, but I would love Rose Leslie as Vim.
Gary Oldman or Ian McKellen as the Lord Ruler.
While reading the books I always have in mind the aspect of Sam Riley in the film pride, perjudice and zombies as Elend Venture.
Chris Hemsworth as Kelsier and Woody Harrelson as Mars.
I have read Stephen Fry as Breeze, I agree.
Gerard Butler as Ham.
Ken Watanabe as Sazier.