Patrick Stump (Fall Out Boy)- His singing style is very unique/original
M. Shadows (Avenged Sevenfold)- His has a very dark/awesome voice that is just as good live.
Tom Delonge (blink 182)- Also a unique voice, even if it is somewhat screechy. He is also hilarious.
Kenny Vasoli (The Starting Line)- Basically I give him props for going all out when he sings live... Because he puts a lot of energy into it and he looks like he is about to explode...