ok this may seem really weird but i think it definitly going to end up naru/saku because (now here could be the weird part) i think naruto is going to kill sasuke completly by mistake he is going to go like 4 or 5 tail fox and lose it and sasuke is going to be beg for naruto not to kill him but naruto wont realise what he is doing and kill him anyway. Oh this is ofcourse after he has killed orochi and sakura is lying unconcious somewhere