I agree with a couple of the posts that either flying geese or stars for an outer border would tie this quilt together nicely, putting sashing bands on either side of the pattern. I think the 12" border would work best. From what I can surmise, the top is oblong, not square, & I think the 12" would keep it symmetrical. I definitely would stay away from #1 & #2. Too much distance between the focal point & the border, would be hard to come up with a design for quilting it. I also agree that with all the time & effort you've put into this top, a simple stripped border would be a "cheaters" way out. Put the extra effort into the border as well.