I'm under 21, so I can't buy alcohol and have never had champagne. However, I am a girl, so I was going to say that no matter what kind of champagne you get, also get a bowl of yummy strawberries if you can. I hear those go pretty nice with it, and I love strawberries even all by themselves.
Good luck! I'm engaged myself. I know I'm young, but. We've been together for almost 2 years. lol.
Shellie...epic hopeless romantic.