Cyndi Lauper! hahaha
I really don't know who the BEST is...Voices I do love are, BENI, Emi Hinouchi, and mink...Jennifer Hudson...Lady Gaga does have amazing vocals...she just doesn't always utilize them...
Celine Dion has one of those crazy voices...along with alan omfg

she's amazing.
I will forever have a love affair with Steve Perry's voice from Journey. There's just no comparison to those vocals.
Another male vocalist I'll always love, is Geoff Tate from Queensryche

He sometimes comes close to Steve for me. They both can just hold notes like no one else.
Eiko Shimamiya has one of the most beautiful voices I've ever heard in my life.
oh hiromi too. She has one song where she holds out this note...kills me every time. She's amazing.
I think its really cool when there are amazing vocalists from Japan, because usually their voices are quite unique.
Sometimes, big voices here in the States can...sound a little similar lol sometimes...