Like many others, picking one is so difficult, so I tried to narrow it down and give a reason why...in order, for the most part:
Jeff Beck - amazing ability to reach in and grab the most inventive ideas time after time
George Harrison - played lead on some of the best songs ever written - and he always came through (the bathroom window)
![Wink ;) ;)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
EVH - hands down the best rhythm player in rock - not a bad lead player either
![Wink ;) ;)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Robben Ford - shows you don't have to be a speed player to be a great player
Neil Giraldo - those early Benatar records have a vibe and tone that really influenced me...wildly underrated player
Andy Summers - another big influence...Sting was lucky to get in a band with this genius
George Benson - no explanation really needed
Brett Mason - his technique and sense of rhythm are stunning
Alex Lifeson - couldn't stand Rush in high school, but I love their stuff now... the unsung hero of this trio
Blues Saraceno - another amazingly inventive player with incredibly clean articulation
Don Felder - solo from "One Of These Nights" is one I never tire of hearing
Trevor Rabin - monster player and scored some great movies
Peter Frampton - redefined lead playing for me in my formative years
Yngwie Malmsteen - for sheer technical precision, I'm not sure there is anybody better (if he just wouldn't talk...)
Man that was tough...