Anytime seeing Kisuke Urahara in action is a pleasure to watch. I love the way he fights.
In terms of a lasting impression, this is probably one of my favourite fight scenes:
Fight starts at 7 minutes in but just watch the whole movie. It's awesome!
Vegeta's death on Namek and his revealing to Goku what happened to Planet Vegeta then Goku's ensuing fight with Frieza was always a fight that sticks out in my memory too.