Who is the most powerful member of the Justice League?

Superman is the obvious choice, but I believe it is the Flash because he needs to be able to think as fast as he can move. And think if he just held his finger up to someone’s head and vibrated it really fast! Other possibilities (I am counting the JLU of Bruce Timm, too): J’onn J’onzz/Martian Manhunter (insubstantiality!), Captain Atom (pure energy), Batman (sneaky smart), Wonder Woman (divine power), the Green Lantern (able to make thoughts substantial), Amazo (might be the best pick, being pretty much all-powerful – but then again he is not a full member…). What do you think?

Related question: does anyone know what I’m talking about?