Sorry Phil but I'm going to call foul on this one. The angle break in the wing causes a lot of drag since it's generally accepted that the air flow over the wing has a spanwise component. For straight and level flying the dihedral breaks add drag by causing turbulence around the joints.

However when it's time to turn then it MAY be a different story. The tips being angled more means the rolling couple is stronger than with a simple V wing for the same amount of yaw. Because of this you do not need to yaw as far to roll into the desired turn. It would need to be proven through testing but I suspect that under turning conditions where the model is rolling into or out of the turn then a tip or poly wing would have less drag than a V wing. But for everywhere else the simple V wins the drag war.

Sean, if you plan on sticking with the aileron funcition on this model you don't need any dihedral but if you keep the single V angle as shown it'll produce an easier to fly model when it's out at the limits of your vision and you're flying mostly on instinct and autopilot. I vote for sticking to the original V so the wing does not have even a slight dihedral break to cause any disturbance in the airflow.