First of all, Id like to say that this list is according to my opinion.
Mark Morton of Lamb of God: There is no denying that LOG are one of the biggest names in the present metal scenerio. Their songs are very catchy and are very loud and powerful.
Mark Tremonti of Alter Bridge/Tremonti: He is a guitar player that Im sure anybody would fall in love with. Not in the other way, but his guitar skills would surely mexmerize anybody who hears his music. Catchy and heavy riffs with the combination of melodic solos. Also, the intros in his songs are quite fascinating.
Oli Herbert of All That Remains: The first time I heard ATR, I was in love with them already. They are the real deal baby. If you are into heavy music, I suggest you should definitely check them out. Especially the breath taking riifs and the guitar solos. Oli herbert sure deserves a lot of appreciation for all of those.
Herman Li of Dragonforce: Now if you love guitar, Im assuming Herman Li is no stranger to you. He have a unique style of play and also are very fast. He is a guitarist who loves having fun and experimenting at the same time.
Alexi Laiho of Children of Bodom: His riffs are very heavy, rough and guitar solos would definitely make you fall in love with him and the rest of the band.
Do, check them out for sure.