Caviar and champagne have always been considered the quintessential match when one mentions gourmet pairings.
The most frequently selected champagne in fine restaurants paired with caviar is Dom Pérignon, the leader in the Moët et Chandon line. Vintages are a matter of personal choice, but 1990 seems perfect with Ossetra caviar. Taittinger is another popular choice, as well has vintage Krug.
In the end, personal preferences, as well as your purse or wallet, dictate the choice you make.
Good caviar and good champagne go hand-in-hand. Don't just serve caviar; present it, It is entirely worth it!