Solution for Stripes
I am not a wallpaper expert, but what I have found that helps to hid the "Stripes" is to spackle the stripes so the wall is smooth. I have done this on a wall that was paneled and then I papered the wall and it came out perfect. But if you use a paper that is heavy enough it will most likely hide the "Stripes". If you are worried about the stripes showing, and you don't want to spackle, the only other choice is to use a backing paper and put that up first, and then you put up the wallpaper. This backing paper hides all impurities in the wall and leaves a smooth finish. You can usually find this paper at any paint/wallpaper store. Good Luck with your wallpapering job.
Doug