I really liked the fight between Ichigo and Byakuya Kuchiki, Ichigo's getting wasted up even though in his bankai, and Hollow Ichigo comes out. Byakuya's like "Who are you?" and Hollow is like "Who am I? I ain't got a name!". Don't worry, it sounds wicked in Japanese not like there's an english dub of episode 59 I believe. "O gu naga?" that's what "Who am I" sounds like.
I agree Ichigo's fights when he can't control his holow yet were very exciting plus you dont know when his holow shows up
I choose ichigo vs grimmjow because its when ichigo finaly got his mask to last a long time and its very action packed