Good call on Kristy Cates! I know I'm gonna get a lot of flack for this, but I'm gonna say it anyway:
Idina - I loved her, she had that wild wide eyed look that I've not seen anyone else get. I saw her twice, first time she blew my mind. Second time, she had some serious fatigue in her. I'm not saying she was horrible, and I don't expect her to be super human but... she had some wear and tear.
Shoshana - Where she wasn't a complete rock powerhouse, she most certainly could sing to me anytime she wants too!! And I completely agree that her "No Good Deed" will never be matched.
Saycon - I had the wonderful pleasure of seeing her, and let me say that every note in those songs fit her voice like a glove. It was sick how easy she made them sound. I don't really like her glottal attacks though. But she was vocally amazing.
Ultimately, I would go with early Idina. Got to love her.
"It's the terror of knowing what this world is about, watching some good friends screaming LET ME OUT!" -- Queen