Yeah, I really like a lot of the guys already listed here. I think Blake Richardson has been doing some incredible things on the past few BTBAM releases. Brann Dailor is just great, love that guy. Thank you to @onekillwonder_ for mentioning Dave McClain, who is a criminally underrated and really selfless drummer (tremendous bias here with Machine Head being my favorite band). I'm a little surprised it took so many posts for Mario Duplantier's name to pop up, considering how much his stock is on the rise following L'Enfant Sauvage. Kollias, Mangini, Portnoy, Hoglan all titans - I love Fear Factory's 2010 release, Mechanize and Hoglan was an integral part of that sound.
As far as contributing a new name to the pile, I really like all styles of Shannon Lucas (former All That Remains, now former The Black Dahlia Murder). He was the best part of the Fall of Ideals, left ATR and did some killer work with BDM before leaving them after 3 albums. Excited to see what's next for him. Side note - the guy who replaced him in All That Remains starting with the album Overcome (which marks a significant downturn in my appreciation for ATR), Jason Costa was fantastic on Diecast's Tearing Down Your Blue Skies.
As for Joey Jordison and The Rev, I like them both just fine. They're overrated by some and looked down upon by others. I like Slipknot's early works quite a bit, and some Avenged Sevenfold's later stuff is pretty OK. But like others, I question the choice to mark one's own answer to a question they asked with their first post in a new forum community.