Napa Valley isn't quite like Hollywood (yet), where the stars get by on a first-name basis. Even so, what serious wine collector doesn't know who Helen and Heidi are? While the name Philippe may not register so quickly, winemaker Philippe Melka is definitely a Napa winemaker to watch, a man many believe is poised to become one of the valley's hottest consultants since Helen Turley and Heidi Barrett.