While Semiarundinaria fastuosa does look great and will grow in Zone 6, it does get burn down to the ground about every 3 year in Charleston, WV where my brother grows it. His P. nigra is doing well there. P. v. Robert Young is still alive, but not doing that well. P. bissetti is also doing well but weeps probably more that you are looking for. There is lots of P. arueosulcata growing in the area, which is the sure thing in the area.
Location: Marietta, South Carolina
zone 8a, 60 bamboo species in ground including mature size moso, Bambusa, Bashania, Borinda, Chusquea, Fargesia, Himalayacalamus, Phyllostachys, Pleioblastus, Pseudosasa, Qiongzhuea, Sasa, Sasaella, Semiarundinaria, Shibataea, Y
Semiarundianria fastuosa can develop a weeping form quite unlike its sun-grown stiffly upright form when grown in part shade and all of its running shoots are removed to force it to grow as a tight clump. Here's pics of the one in my garden.