There are so many great guitar tones! Some that immediately spring to mind for me would be Leslie West, Gary Moore, Robin Trower, Warren Haynes, Schenker/Scorpions, Paul Kossoff, AC/DC, Ritchie Blackmore, Richie Kotzen, Ty Tabor, Tony Iommi, Roy Buchanan, Robben Ford, Chris Whitley, the guys who played on Matthew Sweet's albums (Robert Quine, Richard Lloyd, Ivan Julian).
I especially love huge, fat, sustaining sounds like early-ish Santana and Dave Meniketti's solos on Y&T's Black Tiger and Mean Streak albums. And I have a fairly obscure album by a band called The Mother Station with Gwin Spencer on guitar - she has some of the most awesome, fat guitar tones I've ever heard.
All this confirms JDC's original comment at the top of the thread that "tone is obviously a subjective thing and down to personal preference". :lol: