I grow sweet peas extensively and use grape vine stakes about 10 feet tall and put into the ground about a foot or two. Netting is placed between these; and the peas climb up the netting. Sweet peas are not in flower for long however; remember, you seem to want privacy and the flowers do not last all season. They are rather short-lived and this is something for you to consider if you want long term vines. The perennial version of sweet pea is too short and they do not really climb. Hops might be a better choice as they seem to get dense. I grow these too, but on the other end of the garden. At any rate, the grape stakes work very well and are sturdy, strong, rust proof, and not that expensive.

Think about your choice of vine.

Hopflower, that is a brilliant idea. It's something not too elaborate, too, and that I think we could do (neither of us being terribly good at things like that). Thank you for the advice on vines, too - I guess it was just the nostalgic pull of sweet peas. I will research vines and try for something better. I would never have thought of hops, though, in spite of being a British Mystery fan! I must check that out, it sounds good.