If you're purchasing a sparkling wine this holiday season, it's easy to keep it local. After all, some of the finest American choices are produced in our own backyard. Following is a list of my top-ten local sparkling wine choices. Half of these wineries are set in Carneros, an area that covers parts of both Sonoma and Napa Valley that is perfectly suited for Pinot Noir and Chardonnay grape growing (the two varietals most commonly used for sparkling wines). The other half are located in other parts of Napa and the Anderson Valleys.