I weighed my sails last week. I choose sails now more on lack of weight than on performance.
You can really feel the extra weight particularly in transitions.
Code Red 5,6---4.8kg
Maui TR9 5.5m---5 5kg
North Warp 5.7 2011----5.3kg
R3 6.2----6.2kg
NP RS Slalom 2012 7.0----6.0kg
The difference between the Code Red and the Warp is only 500g but pick them up and the difference feels huge!
A really light,stiff boom can make a big difference too.
I stay away from carbon extensions and super light 100 per cent masts as I'm not made of money
Have one 100 percent mast,a X9 Wave 430 that has thicker walls and at 1.8 kg a bit heavier.