I love to listen to Candlemass (Swedish doom metal) sometimes. I haven't explored a lot of doom metal but I loved them the first time I watched the "Bewitched" music video.

Here's two full albums. I usually enjoy their older stuff.

Epicus Doomicus Metallicus: http://www.youtube.com/watch?v=Z33VWOaCImQ
Nightfall: http://www.youtube.com/watch?v=VyKi2I0m08w

I don't specifically stick to just this type of metal but I love it!