1. Geoff Tate / Operation Mindcrime.
Not sure what else needs to be said about this. Just the pinnacle of operatic heavy metal singing.
2. Tom Englund (Evergrey) / In Search of Truth
Haunting, so much emotion just pours out of this guy. Lyrically, it's a concept album about being abducted by aliens - you can hear his fear, paranoia, and anguish all throughout this disc.
3. Halford - Resurrection
I didn't think he had this in him when it came out. Screaming like a banshee on the title track, singing wonderfully on Silent Screams, and just a clinic on straight-up metal singing throughout the disc. He sounds phenomenal on this album.
Also echo the James Hetfield / Load comments - that's probably his best album, vocally.