Hard to pick only a few but here is a list of guitarists just at top of my head who know their shit
John Petrucci
Stevie Vai
Joe Satriani
Stevie Ray Vaughn
Jimi Hendrix
Slash
Eric Clapton
Jimmy Page
Randy Rhodes
Van Halen
Frank Zappa
Gary Moore
as for down strokin da comp guitar....Jamez Hetfield
