I enjoy Opeth's entire discography. I saw them live back in April (how appropriate) with Katatonia, at the Guelph Concert Theatre. It was a great show. In the metal category I also enjoy: Mastodon, Machine Head, Deftones, Death, SoaD. Less often, but still: The Acacia Strain, Behemoth, Disturbed, Emperor (only have In the Nightside Eclipse), Gojira (only have L' enfant Sauvage), Meshuggah (only have Obzen), Metallica, Slayer.