From older stuff, I like Paul Kossof's tone, but for todays stuff, the guitarists in Black Stone Cherry have an awesome tone.
Gibson SG Standard, Gibson SG 60s tribute, Edwards Les Paul, Fender Telecaster, Epiphone SG Custom
I don't know if it's personal bias or not, but I really like David Gilmour's tone. There's something about a strat and a hiwatt stack that just does it for me. Totally one man's opinion though.