I would search for a home that is not on a power line... the hummm noise alone would remind me of the power lines being there. You want to take advantage of this market to find a great home for a great price...not a home with problems or bad location.
I read through all 3 of your questions and the subsequent answers. You are wise to seek a good buy in Vine City - on a tree lined street, maybe on a bluff or ridge overlooking the downtown skyline with a remarkable view - properties that fit this description are in Vine City!
Nevertheless, Vine City is a house by house, street by street neighborhood. I have been concerned for my safety more than once on some of the streets of Vine City. You need to be duly diligent, secure and smart.
At the same time, you seem to have a grasp of the obvious - the issue about powerlines is a compromise that will surely leave you powerless when you decide to resell.
Why don't you buy the old English Avenue school and renovate it into some cool contemporary lofts?
Get your real estate on.
If you are having these concerns then so will any buyer who considers buying your home when you go to sell it. This should be enough evidence for you to make your decision.
If you buy, it will be far more difficult to sell than if the same property weren't near the power lines. And if there is some danger of being so close to the electromagnetic fields, you might not want to live there at all.
If you can, I'd suggest you look elsewhere.
Hope that helps.