Blood Stained
Cathedral Spires -----------> possibly in the top 3 JP songs of all time
Feed On Me
Judas Rising
Worth Fighting For
Hellrider
Angel
Loch Ness ----> seriously. Priest go full on epic doom metal and it works, despite the lyrical cheese.
Prophecy
Sea Of Red

Cathedral Spires
Deal with the Devil
Demoniser
Hellrider
Worth Fighting for
Persecution
Halls of Valhalla
Sword of Damocles
Traitors Gate
Never the Heroes

As an aside, my brother absolutely loves Loch Ness as well.

I don't think I can list just 10 songs from 6 albums, that's quite difficult. Maybe tweak it and say from the return of Halford onwards or something.

From Angel Of Retribution:

Demonizer
Hellrider

From Nostradamus:

Prophecy

From Redeemer Of Souls:

Dragonaut
Halls Of Valhalla
Battle Cry

From Firepower:

Firepower
Evil Never Dies
Necromancer
No Surrender

If I have to include songs from Ripper Owens Priest, then...

From Jugulator:

Blood Stained (I really struggled getting into Jugulator, still do)

From Demolition:

One On One
Hell Is Home
Metal Messiah