There are occasions when only the genuine item will do.   If that is your approach this Thanksgiving, you should immediately seek the classic Champagne Piper-Heidsieck Brut Cuvee NV.  This elegant, dry French Champagne is a blend of Pinot Noir and Pinot Meuniers grapes from the Reims region of Champagne.   The Piper-Heidsieck Brut NV features a satisfying toasty finish with the telltale tiny bubbles that give its drinker a smooth, balanced mouthful.  Never harsh, yet retaining a touch of crisp acidity, the Piper-Heidsieck has been a house favorite for several years.   Unlike many world class sparklers, this bubbly is widely distributed, meaning that a clever wine sleuth is quite likely to locate a bottle or three for a deep discount off its $50 retail price.   The critics consistently award this wine high marks, with Wine Enthusiast awarding the most recent release a 92 rating and Wine Spectator following suit with a very solid 91.   What better way to toast all your blessing with loved ones than to pour the Piper-Heidsieck Brut?