Almost any Vergil cut-scene in the game. Imagine that when I bought, I didn't have an Internet connection so I had no clue about the game's whereabouts except for one picture of Dante's which made it sure that it was going to be a prequel. So, I go to a random store to buy a game, and I see it. Not the Special Edition, so still no picture of Vergil on the box. I open it after I bought it and Vergil was in the last page of the manual, looking all badass. From that moment I knew I was gonna love him as a character.
Besides that, I really like the 'last' cut-scene were Dante is dressed DMC1-style. For me that's my favourite Dante and that meant a lot!