I always liked Mark Martin, even before he joined Rousch. I tend to pull for Carl Edwards, but I have to admit that Kyle Busch is gaining my admiration for going WFO at every track.
All time favorites not neccessarily in order:
Allen Kulwicki
Fireball Roberts
Junior Johnson
Davey Allison
Bill Elliot
Danny Ongias
Rick Mears
Bobby Rahal
Mark Donahue
Al Hobert
Brian Redman
Jimmy Clark
Kenny Roberts These last four are motorcycle racers.
Gary Nixon
Dick Mann
Freddy Spencer
I had the luck and priviledge to meet all of these except Kulwicki, Elliot, Jimmy Clark, and Dick Mann