Thanks for your useful comments on my choice for circle compositions. I did go away and print some more and try overlapping some of the circles ( E and F above- ignore the red pin!). Then I asked Ian for his opinion - he said A because of the tonal range and suggestion of circles, that it was the most abstract.
So modifications of that and D to produce G.
Think I'll leave them on the design wall to mellow for a while a la EB . Off to Box Hill again tomorrow - weather forecast looks set to blow the cobwebs away.