Some suggestions:
Vomir - Proanomie (At War With False Noise, 2008)
Alongside with The Rita and the compilation Total Slitting Of Throats, Vomir is the face of HNW and I feel this is is his first release that got widespread attention being on a bigger label with more promotion but also a defines his style and HNW in general.
Lasse Marhaug – Science Fiction Room Service (Jazzassin Records, 1996)
First big noise release from a Norway based artist ? Not his biggest release with the most attention (that would be 'The Shape Of Rock To Come' with 2000 copies, got mainstream attention) or the most noisy album of him, but a defining work I would say. Somewhere between harsh noise and manipulated freejazz.
Kevin Drumm – Sheer Hellish Miasma (Editions Mego, 2002)
Got quite a lot attention in more mainstream media and several represses, and also a very good album. Quite droney, but also lots of harsh parts and with an own distinct sound.
Sword Heaven - Entrance (Load, 2007)
Percussive destruction, pretty unique and got quite some attention. However pretty much tied to noise rock and possible more 'musical' than most albums mentioned, but I feel it's rather part of noise than just 'more abrasive noise rock'.
Would also vouch for LeftHandedDecision - Instinct & Emotion, like Zeno Marx mentioned.