Love your quilt! I like your original idea. it will look really nice. Black or a darker colour border will frame your quilt nicely. I think that instead of the pastel binding I'd use the black or darker border you used before to finish it. I think that the tan border, though nice, will not define the quilt as much because the tan blocks will 'melt' with the border and into the quilt. It all depends on what sort of effect you are looking for. It is a gorgeous quilt!
