Ultimate Idol

In light of American Idol starting up again I was thinking about what the ultimate idol would look like. I mean, you take the best singers and bring them together, who would win. Here's an idea for some of the top twelve, six males and three females, mind can't think of anymore female vocalists, maybe you could help me out.

John Schlitt (Petra) Amy Lee (Evanesence)
Greg X. Volz (former lead singer from Petra) Mariah Carey
Bono (U2) Sarah McLoughlin
Jon Bon Jovi (Bon Jovi)
Steven Tyler (Areosmith)
Matthew Ward