If you're looking for cases without RGB added, check out Fractals offerings, they dont seem to add any of that shit at all and they make pretty nice cases overall, especially the defines and the new torrent case. For coolers, if you want one without RGB and great fans out of the box you could go with anything from Noctua (moreso their black edition products, the normal fans look like shit), otherwise the rest of the competition seems to include fans with at least single colour lights if not RGB. As for motherboards youre fucked if you want top spec and no RGB unless you went for some workstation-tier board