Sasuke outshines them all. He will outshine Itachi and probably has already. Here are some quotes about what has been stated in the manga:
"Tobi, Itachi, and Orochimaru have all stated that Sasuke possesses the unique potential to become much stronger than his older brother, who was already considered a genius above all others."
"Tobi has also stated that in time, Sasuke could become more powerful than Nagato."
If he became more powerful than Nagato, he would be stronger than Naruto.