The Father-Son kamehameha versus Cell was probably the best one in the series.
On an unrelated note, I dusted off my old PS2 and played some Budokai 3. It was super fun to replay the game, but what really caused the nostalgia to flow was the opening theme.
Not to get too off-topic, but what's so bad about Dolphin / other later gen emus? I'm upgrading my computer (as my current one is so sad it literally runs these types of games at 3 fps) and was hoping to have a bit of nostalgic fun. Are they slow, buggy, or just not the same?