I am jumping into the deep water here, but in my opinion adding the dark fabric right next to the 9 patches would take away from the 9 patches everywhere they are next to the border. I would choose one of the fabrics that doesn't touch the outside of the quilt top; from what I can see, maybe one of the reds. I would make a narrow border of that color then a wider one, to match the width in the 9P of that darker fabric in the 9P.