What I'm listening to right now- Opeth- Moonlapse Vertigo
Opeth has tagged themselves as a progressive death metal band, and I believe that is fairly accurate to what they are. They play songs in the 10-15 minute range, all the time playing with song structures and jumping between crushing death metal and scandinavian accoustic folk music. As of late they have also been showing their prog rock roots too. They are one of my favorite bands out right now because there is no other band that sounds similar to them, and vocalist Mikael has the best death growls I've heard. On top of that, a good clean vocal sound as well.
YouTube - Opeth - Moonlapse Vertigo