Sorry to be obvious but I heard it first 25 years ago and have never stopped loving it.
2. Rock n Roll Damnation
Epitome of everything that's great about Powerage, I think '/DC's most underestimated record with Bon Scott.
3. Overdose.
Almost a love song - as opposed to a smut song - but done big hard rock style.
These 3 obviously exclude Brian Johnson. In the interests of balance, I have to say that the album I've played most by AC/DC since 1982 is For Those About To Rock. It's a bit too polished but it certainly brings the rock for me. I like cannons.