SKip it all and go for what your wife would like the most. We too live near a busy street. I found that a waterfall near the window makes for a great noise distration. I haven't heard of nor do I believe in a single product that totally eliminates traffic noise but a fall 1/3 way up the window is nice and soothing. Yes, you still hear some of the traffic noise but the waterfall makes it that much easier to handle.