I'm being facetious of course, but that Flay guy does not impress me. His on-air persona at least is kind of superior and unapproachable, however skilled and talented a cook he may be.
Alton Brown, on the other hand, is charismatic, likeable, knowledgeable and self-effacing. His show isn't just entertaining, it's educational.
George Duran? Duran's awesome, too. Good sense of humor, sense of culinary adventure.
Sandra Lee? Tits on a stick. Sorry, but she's so very dull and fake to me, I can't watch her. Good recipes, but that's it.