Pseudosasa japonica (arrow bamboo)....
It does well in pots, is suited for your zone, can take a good bit of wind and is very tropical looking.

The problem is overwintering that bamboo on your roof. There is BIG difference between life in a container and in the ground. The same bamboo that is perfectly hardy in your area in the ground will have much bigger challenge in a container. In a mild winter, you shouldn't have a problem, I am betting you would in a typical zone 7 winter. If you could protect the container and the foliage from the winter winds it would help.