Nagato's chou shinra tensei = should be stronger than the one that detroyed konoha, since it was stated by naruto that nagatos techniques are far stronger and faster than when e is using reanimated corpses. itachis genjutsu range is 5 metres. nagato just has to keep the distance which shouldn't be hard for him with his shinra tensei , there is no way i can see itachi countering a justu that dispels jutsus, nagato with shinra tensei alone should take this fight. Let alone his other techniques.
or nagato flys in the air out of range, and uses Mirrored Sudden Attacker Technique,
Rain Tiger at Will Technique, and summons all his beasts to the battlefield.