Harry Potter: Who are the top ten most powerful Wizards and Witches?

I wouldn't put here Molly Weasley. I would put higher Snape (in my opinion he should be 4th) and Bellatrix- she was more powerful than, for example, McGonnagal. And I would mention more Death Eaters. And, of course, I wouldn't miss Harry, he would be close to the top.