Fuck yeah, love a bit of the 'Head.
My favourite album by them would probably be 1916. By their standards, I'd say it's their most diverse, with stuff like the title track, Love Me Forever, Nightmare/The Dreamtime and R.A.M.O.N.E.S. as well as their more usual style. Gonna buy the Classic Rock fan pack version of the new album. At least you know what you're gonna get with them.
Aside from the obvious classics like Ace Of Spades, they've got loads of great album tracks. Step Down, Shine, Angel City, Smiling Like A Killer and Whorehouse Blues being the ones that first come to mind.