What Devlyn says. I grow both bush and pole beans. Both are productive, but I much prefer harvesting the pole beans - standing vs. bending over. Both also produce continuously for 3 or 4 months. Depending on conditions (and yoyr appetite), a couple of plants could be enough.
I use long, flexible bamboo canes to support the pole beans, and then I bend them down and tie them together to form an arch so that they're easily accessible to wee folks like my wife and me.