Nevermores Jeff Loomis
Dream Theaters John Petrucci
Wes Borland of Limp Bizkit used a 7 string for most of his early career with the band.
Soulflys guitarist has a signature Stealth (BC Rich)
Slayers Kerry king
Rusty Cooley uses 7 string guitars
Fear Factorys guitarist does
Muse used a 7 string for their song Citizen Erased