I'd say your quilt calls for a custom quilting job. I made one similar to this and stitched in the ditch around most of the arc sections, then did a small meander in the background. It looks fine but I have seen others that were custom fmq and they looked good too. Then there's also what color thread to use?
Look at Valori Wells book, "Radiant New York Beauties". She shows many ideas for fmq these quilts.