You're really struggling with the metal part. Front 242 are EBM (electronic body music), they are dance based. There's no metal there. Thrill Kill Kult is more like goth than anything else, certainly no metal there. NIN? Again, not metal. Rock if anything. That said, a lot of my picks are in this thread already. Godflesh, Ministry, Strapping Young Lad, The Kovenant - Animatronic, DHG - 666 International... I would also add Neurosis - Through Silver in Blood although calling that one industrial metal is a bit of a stretch even though it has a lot of industrial and a lot of metal in it. Swans - Filth is an untouchable masterpiece. Raw, nasty, spitting vile hatred. Absolutely brutal and crushing. I wouldn't agree with Fear Factory. I've always considered them kindergarten metal for meatheads. Such simple riffs. The riffs are the most important part of a metal band and their riffs are awful. I did always like Rhys Fulber's keyboard work. Check out the Front Line Assembly album "Millennium" for more of his keyboard work, but I should mention that the riffs on that album, while played by Devin Townsend, are mostly riffs from classic bands like Pantera and Metallica.