Thanks for the variety of pronunciations!
I checked that scholastic site, Annette_VA, but no luck on finding the name there.
As for the Jim Dale pronunciations, I agree that he does pronounce words differently than they are pronounced in the movies, etc. For example, he pronounces Lord Voldemort's name like "Vol-da-more". In the movies, they add the t at the end so you hear it as "Vol-da-mort". I do have to say that I love listening to the Jim Dale CD's immensely, though!
Hopefully, we'll find out the real pronunciation of Scrimgeour soon!