My favs are...

Rock Lee vs Gaara is of course the best one so far mostly cause Lee was at his best when he opened the gates,showed his real speed. I hope we see Rock Lee fight like that again soon.

Naruto vs Gaara before Gamabunta and Gaara's demon came out cuase Naruto for once used his bunshin wisely.

Gaara vs Kimimaro mostly cause Gaara news moves are cool and Kimi is a freak.