IIRC, a certain D. Tennant Esq. was #2 on the list...I'm pretty sure if he hadn't wanted to do it RTD would have found someone else, and probably had a whole list of people lined up
Hugh Grant was in talks for the role but turned it down and said later that he regretted it.
And who can forget the Daily Mail announcing that Bill Nighy had got the job on the same day the BBC announced it was Eccleston.