A lot of people won't buy a house where they can so much as SEE a power line or tower - much less be "on top of one". Also ... and you may or may not care - taxes on new construction are a lot higher. Are you sure there isn't a house out there that you'd like to be in?
I love Pittsburgh - the Sharp Edge is about my favorite bar in all of PA. Good luck!
I think you have to ask yourself it you ever plan on moving? If you could avoid it, I would because of the negative stigmatisim.