colorblind, You have 40 feet you want to cover and $500 to spend. You have been given the best advice of experts on would be a better choice than the three you insist you want to use. Your choice seems to be based on what local nurseries want to quote you or your dictates for an instant dense screen. You are imposing a choice that fits your insistence on instant screening which excludes the advice of possible better choices. I think you could easily find someone to plant 5 Green Giants or other suitable trees to fill your 40 foot space. If the people you have had quote the project cannot meet your needs it would be far better to keep looking. Pool seasom is over for the year; it will not start up again until Memorial Day which gives you all fall and even Spring to find someone who can plant 5 good sized trees to screen your neighbor's pool. It won't be peek proof right away. You have obviously lived with your own pool with no screen for a while. What's the hurry? Why not do it right? You seem to want a short-term, instant fix to something you will have to look at for a long time. If you don't want suggestions, then put the three alternatives you have had dictated to / by you in a hat and pick one out and live with it. What's the hurry? You have a fence, your neighbor will have a fence and you will have a growing screen of good sized trees. I don't see the reason to rush and put in something that you may regret in a few years. Jon

Genista (related to brooms/Cytisus) is a good suggestion. I just have no experience with genista other than low growing groundcover types. Didn't realize they could grow quite so large!

Ginkgo trees measure 14 feet in height and 5 feet in width. They are hardy, require little maintenance, and their leaves turn an attractive golden color in the fall. Next is the bamboo, which grows quickly and is hardy. Typically, bamboo reaches 10 feet in a pot and 12 to 15 feet in the ground. The last type is the brightly colored dogwood. It produces white, pink, and red flowers in changing seasons. With a height of 15 feet and a canopy width of 15 feet, it is suitable for medium to large backyards. Suitable for planting in moist, well-drained soil.

I’m not a pro, but have some non-pro thoughts. Firstly, I would not try to hide the porch with the evergreens. And I’d move a couple of the boulders out away from the porch for a more naturalized placement. Create some berms and place the trees and smaller evergreens away from the porch (toward street) so that it feels natural but also enhances the view of your home.