Legend status I would say Keith Richards. His rumored debauchery has taken on 'Tall Tale' status, he manages to remain cool and enigmatic, all while crossing into mainstream pop culture (Pirates of the Caribbean). He may not be an incredible showman like others mentioned, but cool and unchanging are pretty damn important elements for rockstars.
Modern day? I think Dave Grohl is cementing himself as the Savior of rock 'n roll. He's truly a renaissance man of the genre, Sonic Highways was a really really great album (and even better documentary), and the guy is just funny as hell. I think he's already penned a couple of the best rock tracks in the last 20 years which is a huge bonus too, and I'm not even a huge Foo Fighters fan.