The whole damn fight between Naruto and Han, especially when both of them tap into their Tailed Beasts' power.
The last chapter of Part One which finishes up the Pre-Timeskip part of the story. The last part of the chapter becomes a montage of nearly every major character alive training set to "Knights of Cydonia" in a way that is similar to the "Epiclogue" of another fanfic: Fairly English Story.
Naruto and Hinata's fight. Hell, the entire third phase of the Chuunin Exams could count as a CMoA, with highlights including any fight involving any member of the Konoha 12, but especially Naruto, Hinata, Sasuke, Lee, Neji, and Shikamaru. Choji probably had the best match ending when he basically caused a large scale earthquake with a C-rank technique, destroying the entire arena floor.
Then there were the preliminaries, where Naruto and Lee had a most epic fight, and Hinata trounced her opponent in two to four seconds.
"Do you not remember who I am? Do you not know what my bloodline can do? Since my training with Ghost-sensei and everyone else had started, my skills have improved dramatically, and yet you assume that Naruto-kun here can lie to me of all people and not get caught?" She stared at the councilors with an icy cold stare with the veins bulging from the side of her eyes. "I am the Hyuuga Heiress, and I can see everything as clear as day. The way you move shows me how you think, the way you act, the way you live. From what I've seen… I'd rather take my chances with the so called demon then any of you."
Take Two, Round Two
Gaara's fight against Deidara this time around. A beautiful showing from both sides, but highlights include Deidara using his C3 and then his C4 on Suna, only to be countered by Gaara attacking him with the entire desert. Deidara later compares it to fighting Itachi in his Tsukiyomi or Pein.
There was no sky. There was no land. There were no people. There was no hidden village. There was only the desert truly coming to life, rising like a reverse waterfall to crush anything in its path like the force of nature it was.
Shikamaru probably puts it best:
"Why did we think he needed help again?"
Naruto facing off against Haku and Zabuza where he Level 2 Rasenshuriken to obliterate a Huge Ass Ice Dragon that he wouldn't been able to beat with a regular Rasenshuriken.
Hidan made the mistake of insulting Konan in the middle of an Akatsuki meeting. Konan asked to be able to duel him in return. The resulting "fight" cements Konan's place as the second-in-command of Akatsuki.
The battle between Hinata, Tenten, Choji, Shino, and Kurama against the dimension jumpers who recently arrived. Despite how much experience the members from Konoha have, they still are on the backfoot against their opponent until Kurama intervenes.
And then Dima shows up and would have killed Kurama along with others with his Light based powers if Sylvia hadn't intervened.
Gai, Fuu, Lee, Kin, Hiruzen, and Neji vs Kakuzu and Hidan
Hiruzen manages to hold back Kakuzu while using elemental nunchucks with his staff.
Team Gai & Fuu fight Hidan who can now open The Gates. Gai figure out that disarming him of weapons will prevent him from taking blood and Lee literally disarms him before he even notices.
Hidan unlocks Presence due to Tobi putting a Genjutsu in him to test it and it results in him calling a God from outside the universe to empower him and becomes an Acolyte. He causes mindrape with his mere presence and fights Gai, Lee, and Kin who are using The Gates as high as they can safely use. Hiruzen manages to seal him inside an area of Frozen Time only for him to punch through it and kill Gai.
Fuu using Choumei's Full Form to wrestle a maddened Kakuzu.
Crypt fights off Carmen and Sasori while playing around before getting serious when the God arrives. He stops the God from killing anyone else and curbstomps Hidan before severing the connection and going to kill off Carmen.
He also planned out causing the degradation of Hidan's God state to that of a Demon.
The entire Iwa battle:
Naruto saves Sai from getting impaled while taking the hit and uses the chakra receiver rod to paralyze Pain's bodies and destroy them all instantly with clones armed with Rasengan while decapitating Nagato's body.
Sasori takes the Third Kazekage puppet body as his own and uses multiple hearts stored to fuel his technique's power.
During a hectic battle against Kisame, Roushi and Son Gokuu are struggling. Then, however, the Tailed Beast briefly awakens to his true nature as the embodiment of the World's Core, and proceeds to obliterate Kisame with an eruption of molten iron.
Naruto's Heaven Fall technique which he prepared in the days leading up to take control of the atmosphere and Gaara could feel the effect all the way from Suna.
Naruto pulls off two enormous feats of destructive power during the Battle For Iwagakure - multiple enormous tornadoes of shredding Wind capable of giving pause to the Five-Tails and the Gedou-Mazou Statue (and killing Deidara when he gets caught in one), and releasing hundreds of varying-power explosive tags to bomb pretty much the entire battlefield (accompanied by an air-raid siren, no less, to warn his allies to duck & cover).
