Saint-Hilaire sparkling wine. It is made in Limoux, and is therefore the Champagne method. However it also was one of the first sprakling wines produced and predates Champagnes. It is very good for about $10-11 U.S.
My wife's favorite is Veuve Clicquot, and their non-vintage Champagne runs about $40 U.S.
You can find California sparklers from Domaine Chandon and Mumm Napa that run between the Saint-Hilaire and Veuve in price that are excellent as well.
My thought is, if the Champagne/Sparkling wine will be drunk at the end of the meal, there is really no reason to spend a big chunk on Champagne when everyone's palate has already been influenced by other drinks smile.
You really can't go wrong with the Saint-Hilaire, it's a staple for us at our Christmas party.