While not a move per-se I do so love the Sharingan, just for the glare factor.
Favorite move though... I do like the rasengan, though I've not yet seen the extent of its real power as nobody's been hit with a full power one (save Kabuto who was defending with chakra). Chidori's nice as well, only move I can recall seeing that can put a hand all the way through another person.

And while it's also not a "move" per-se... well.. "DYNAMIC ENTRY!"