hmm I guess I see Daniel Radcliffe as Harry, though with black hair as for Snape, I always picture him as Maynard James Keenan of Tool (when he wears a black wig) He's too short for snape though, but he has the age and nose I envision. He also has the sexy voice, though AR is also wonderful. I think Alan goes a wonderful job as Snape, just he's too old. Makes me feel like a bit of a perv, er well a super perv when I'm slashing Alan and Dan in the movies...
My friends who haven't read the books think I'm messed up because they think that Snape is like 60 or something like Alan Rickman and poor innocent Harry is 14. I inform then that there is only a 20 year difference between them ^_^