That quilt is gorgeous.
For me personally I don't like "framing" a quilt. I like for my binding to match my borders. When my border is multicolored with different fabrics like yours is I would measure each section, add 1/2" and cut each color to match. Then I sew the pieces together and bind. Hope that made sense. It is a lot of work, I know, but the results can be stunning.
Sybil