That's a good list you've got there!
Both Maleficent (who I agree was an exceptional villain - how bad would it be to cross her!) and the step mother in Snow White weren't 'ugly' villains...in fact they both had elements of beauty to them - it was their jealousy and desire to be the best that hindered them!
And you've reminded me of Rattigan! Oh what a film Basil The Great Mouse Detective is! I love it and Rattigan, as you said, did have class and intelligence (oh how good was Vincent Price as the voice of that character!) - and you're right, the epic battle of that film with Rattigan going crazy really is scary!!