This diverse mix of reds and whites are bound by a common thread: They all deliver terrific value. Also, different styles of Riesling offer many options for enjoyment. South Africa has steadily grown in importance with U.S. wine lovers. A big part of the reason is price. And for those who want to enjoy their sparkling wines without breaking the bank, look west. Fruity, fresh versions from California and Washington provide plenty of pleasure and are ideal for holiday entertaining. Wine Spectator senior editor Bruce Sanderson explains.