Cava nearly matches the quality of Champagne, and pairs nicely with peach puree in a Bellini. It even uses the same production method as Champagne, though the grapes come Catalonia in Spain.
"Too much fruit can overpower the [champagne] and drown out the carbonation." Another popular brunch cocktail, a bellini is similar to a mimosa in that it's made of champagne (Veuve Clicquot is ...