Tony Kakko (Sonata Arctica)
Jorn Lande (Jorn, ARK, Masterplan)
David Readman (Pink Cream 69, ex-Adagio)
Kahn (Kamelot)
Daniel Gildenlow (Pain of Salvation)
Floor Jansen (After Forever)
Marcela Bovio (Ayreon-Human Equation, Stream of Passion)
That is about all I can think of now that stand out to me when I hear them. I want to put a special note in on Tony Kakko. I think his voice is underappreciated and he creates a special kind of atmosphere with it imo. It is one of those things that is just hard to explain and more of just how it makes me feel, I dunno....