Noise Marines are outstanding units, able to move and fire, as well as equip their champions with any number of cool upgrades such as the Doom Siren.
My own Noise Marine champion has amongst his other exploits, defended an objective single-handedly, driving off five enemy Space Marines, and shouted at a Hammerhead, blowing it up using a Doom Siren.
If your going for a Slaneesh army take Lucius, a Lash of Submission sorcerer, three or four Noise Marine Units, along with a unit of Chaos Marines with the Icon of Slaneesh (for holding rear objectives/anti-tank) as well as some obliterators.