Don't discount Sakura, remember how well she stood up to Sasori and she also appears to have strengthened her defensive genjutsu signifigantly- when they faced the Itachi "clone" Naruto fell under the genjutsu easily and even Kakashi started to, Sakura didn't at all. I'm hoping Kishimoto will also finally show Sakura using her water element affinity offensively, that would be so cool, and Sasuke would be thrown off balance if she doused a katon. He wouldn't expect her to be able to counter any of his abilities.
Sai looks to be along as well and he had the speed to counter Sasuke's sword strike before. Lee as well will likely be more of a challenge than you think for Sasuke. Kiba's the one I could see getting his butt handed to him the most quickly, he has a hot temper and tends to jump into things without thinking.