Hello SteveC,
the size sail I planned to buy is a 9.7 AC2 Point-7 (a new italian brand) with ITS mast. I'd opt for the 75% because the 100% is compulsory for strong wind and I plan to use the formula only in light winds (<12kn). Morover is stronger and cheaper (I'm a student). I can lose 0,5 kg rather than acquire a 100%
The boom...I know that it's very important, but I have no money, so for now I'd buy an alluminium boom...for light winds it can be a valid alternative with 2 years warranty