Not trying to sound like a Fanboy here but:
1. Sasuke
2. Naruto
3. Itachi
4. Gai
5. Kakashi
Sasuke because every time I see him fight, his moves are very ninja-like. It's so awesome, his taijutsu is just awesome. (Damn it sounding like a fanboy)
Naruto because although it's getting old, he finds a way to make Rasengan seem awesome. I think he should work on using his kage bunshin a bit more creative though.
Itachi because his moves are like Sasuke's, the only thing is, he suffers too much from his illness. Maybe in the coming arc, he will be able to look way better!
Gai because his moves seem so strong. The way he mixes taijutsu and ninjutsu in his moves are quite amazing in my perspective.
Kakashi simply because his way of fighting is interesting. It's different, and he can copy moves off people so it's unpredictable.
