Out of everything I've been watching i.e. Darker than Black, Wellber no Monogatari, Claymore, El Cazador de la Bruja, Tengen Toppa Gurren Lagann RomeoXJuliet and Seirei no Moribito -Guardian of the Sacred Spirit-. As far as gorgeous animation, art and story go I would say Seirei no Moribito wins...