looking for new board
 

I'm looking for a new board for light wind conditions <10 mph, here at the James River in VA and read about Futura vs Isonic Starboard. I currently have a Mistral 150L Explosion with a 6.7 m and 8.5m Neil Pryde sail. What would be the best light air board and next sail size to complement my quiver as a 150 lbs intermediate windsurfer?