Speed: Either Yngwie Malmsteen or Micheal Angelo Batio...that's close.
Technicality: John Petrucci!
Songwriting: David Gilmour.
Originality: Jimi Hendrix.
Heaviness: Diamond (Dimebag) Darrell
Slide: I don't listen to enough slide to give an accurrate answer.
Blues: Stevie Ray Vaughn
Overall: This is an IMPOSSIBLE question to answer.
I like this picture of Dimebag....Since he was being discussed...
[FONT=Times New Roman]In the guitar world, Les really is more....[/FONT]