As mentioned numerous times in this thread, there is no correct answer, but....
I never get bored of watching Stevie Ray Vaughan, despite multiple visits to the same concert footage, I continue to be in awe of his talent and will forever be saddened by his loss.
Jimmy Page is phenomenal as was Frank Zappa.
A couple that I don't think have been mentioned are Guthrie Govan and Ron 'Bumblefoot' Thal. Technically brilliant and nice guys to boot.