Headmaster at Hogwarts post Deathly Hallows?

Okay, I KNOW already it isn't said in the book. I just want to know if you could make your best guess, who would it be? Other than McGonagall- (cuz i think it's been said it wasn't her..I mean she was 70 in Philosopher's Stone, so she'd be around 100 by then), who would be a good Headmaster?