Well probably my fav guitarist of all time is Saul Hudson (Slash) and the rest are (in no particular order):

Mikael Åkerfeldt (Opeth) he is also a great songwriter
Peter Lindgren (Opeth)
Kirk Hammet (Metallica)
Jeff Hanneman (Slayer)
Adam Jones (Tool)
Peter Wichers and Ole Frenning (Soilwork)
Thats it! :D