Manilla Road: Having been around for over 25 years, and with 14 albums under their belt, I'd say they're a worthy addition. 
http://truemetal.org/manillaroad/main.html
Brocas Helm: They've also been around forever, but with only 3 albums to their name (& a demo). Very cult in the US underground, and an obvious huge influence on the playing style of Slough Feg.
http://californiacosplaytimes.com/main.html
Pagan Altar: Phenomenal NWOBHM satanic-doom band with 2 masterpieces in their catalog. First one, "Vol. 1" was released back in the day, and their latest only came out last year, but contains material that was written in 1981 (or thereabouts).
http://www.paganaltar.co.uk/
Thunderstorm: Classic doom, in the style of Candlemass etc, but with EPIC melody. Three albums, one demo, all outstanding.
http://www.thunderstorm-doom.com/
Dark Quarterer: 80's cult heavy metal doom band, very cult, deserve some attention, and I've only just ordered their debut album a few days ago.
http://www.darkquarterer.com/

http://truemetal.org/manillaroad/main.html
Brocas Helm: They've also been around forever, but with only 3 albums to their name (& a demo). Very cult in the US underground, and an obvious huge influence on the playing style of Slough Feg.
http://californiacosplaytimes.com/main.html
Pagan Altar: Phenomenal NWOBHM satanic-doom band with 2 masterpieces in their catalog. First one, "Vol. 1" was released back in the day, and their latest only came out last year, but contains material that was written in 1981 (or thereabouts).
http://www.paganaltar.co.uk/
Thunderstorm: Classic doom, in the style of Candlemass etc, but with EPIC melody. Three albums, one demo, all outstanding.
http://www.thunderstorm-doom.com/
Dark Quarterer: 80's cult heavy metal doom band, very cult, deserve some attention, and I've only just ordered their debut album a few days ago.
http://www.darkquarterer.com/