Vulgar Display of Power/Far Beyond Driven

Both these albums are great. Vulgar is a little better than Far Beyond Driven, but if you like one, you'll probably like the other. This is good metal, not hard rock or death metal. Just plain old heavy metal. They're heavier than Metallica but not as heavy as Lamb of God. If you like either those bands, you'll probably like this albums (and any of Pantera's music). Pantera has heavy and melodic guitar rifts and great (metal) vocals.