John Petrucci
Michael Romeo
Chris Broderick
Marc Pattison - Yeah, he is in my band and I may be biased, but I have heard what he can do. Holy shit the guy can really play. He did 9 solo albums before forming Futures End with me and his body of work is incredible.
Al Pitrelli - I know a lot of people will argue this, but he has style and attitude that is totally in your face
Eric Barnett - He is a guitarist in an instrumental band called Points North. He was voted one of the top 10 best in Guitar Player Magazine's Guitar Superstar contest in 2008. Not really a metal player, but a monster shredder nonetheless.
Danny Vargas - Danny is the guitarist for Magistral and pretty much blows away nearly everyone in the genre. Good GOD he can play!