To me Back in Black is head and shoulders above anything else I have heard from them. Its one of those rare albums that I will put in the player and not touch it again 'til it has played through.
I can only judge those which I have heard all the way through. Of the ones that I own, my list goes:
2 Ball Breaker
3 TNT
4 The Razors edge
5 Black Ice
Based on what I am reading in this book, Powerage will likely be my next purchase.
So, AC/DC fans, how does your list look?