#1 and #2 are REALLY hard to rank. I went with Hallowed, but it is really close. My answer might be different tomorrow. War Pigs is great (forum old-timers might know about my affinity for that song.
). I hadn't heard Victim of Changes before clicking on Wild Ranger's link above. The riff is pretty nice, but the song overall doesn't do much for me, and I switched it off about halfway through. But I don't really like Priest anyway, so not surprising.
Anyway, recap of my ranking:
1. Hallowed
2. Puppets
3. War Pigs
...
4. Victim of Changes