I was on the forums to one of my favorite bands from a few years ago, Pressure 4-5 (they are alternative rock), and someone there recommended Katatonia for fans of Pressure 4-5. It was quite funny actually, the typical response for that thread was "why the hell would anyone here want to listen to some shitty death metal band" (i also liked death metal at the time anyway) but I actually checked them out, specifically "Last Fair Deal Gone Down", and have been a fan ever since.