Personal Favorites for me:
Thomas Erak and Tim Ward - The Fall of Troy
Cory Lockwood - A Lot Like Birds
Spencer Chamberlain - Underoath
Johnny Whitney and Jordan Billie - The Blood Brothers
David Marion and Adam Fisher - Fear Before The March of Flames
Daryl Palumbo - Glassjaw
George Pettit - Alexisonfire
James Munoz - The Bled
Josh Scogin - Norma Jean/ The Chariot/ 68
Jordan Blake (Rip) - A Skylit Drive
Dennis Lee - Alesana
Craig Owens - Chiodos (the real chiodos, not the current one)
Danny Stillman - Drop Dead, Gorgeous
There is so many more people that are missing but I can't make it too long. Let me know some of your favorite vocalists of this style and who you think is the best.