Do not bother with VIP. That will only provide lower resolution image (480P, I think). There is no way right now to get full HDTV image from any card to 'overlay' on your screen. And YXY only works with overlay.
HiPix and other cards put out a standard image. I am not sure why you need to re-scale or move it. Is your monitor correctly set up? HiPix does have options for different display modes (I think called crop or full, or something like that). Try those. They work for 4x3 sources to allow stretching the image or enlarging it to fill the screen.