First of all, your quilt is beautiful. If I were quilting it at home, i might try something custom with the colors and white areas separately. However, if I were renting, or even borrowing time on a friend's long arm, I'd do an edge to edge(pants) in something floral and swirly, since the colors are so fun, and the piecing is so angular.
I've borrowed time on my friend's computerized long arm, and it took me days and days to do some of the intricate custom work that I envisioned. She was very gracious to allow me to quilt to my heart's desire, but I felt bad taking up so much time on my quilt when she had a business to run. Since you've already said you were in a 'get 'er done' mood, I would consider an edge to edge and get 'er done.