I adore the TV show Bewitched (love the title font too!), I always wished that with a wrinkle of my nose that I could magically change things around me.
The witch from The Wizard of Oz is just so perfect, and incredibly spooky! She has the cackle absolutely perfected.
So I know this one isn't a Halloween witch, but I had to include the White Witch from The Lion, The Witch and The Wardrobe. The BBC version is the best, and she is one creepy witch. Don't take any Turkish Delight from this crazy lady!
My favorite storybook witch has to be Dorrie, with her little black cat Gink. The books have long been out of print, but after doing some research it appears that certain titles are being reprinted!
And of course to be a true witch, you need a perfectly spooky house.
I always loved the house in the movie Beetlejuice.
But my all time favorite spooky house is The Addam's Family home, similar to The House by the Railroad in this Edward Hopper painting from 1925.