I like Killswitches tones a lot but I can't stand it when the vocalist who can sing really well starts grunting.
System Of A Downs earlier albums had a good metal tone on them but then D.M went for an AC/DC tone on the last two, nothing wrong with the Young brothers tones but didn't work well for my ears in this band.
80's metal I liked Scott Ian's tone in Anthrax. Out of the Hair Metal bands, Mick Mars in Mottley Crue had a massive tone, as did John Sykes on 1987 for Whitesnake.