I've really been getting into Motorhead lately but their discography is fuckin' huge! What are the essential Motorhead albums - besides 'Ace of Spades'?
The only other absolute classic besides Ace of Spades, imo, is Overkill. Definitely get that at all costs. Bomber is also good.
Besides those, I only really listen to Orgasmatron and We Are Motorhead (I've heard the whole discog, btw). Those two are pretty badass.
Also, be warned - the s/t album sounds nothing like the others. It's pretty much just standard hard rock, and sounds really weak in comparison to everything else.