RE: Pros and cons of smaller sails on Formula
Yes, I agree with SteveC that second hand stuff from racer (at end of racing season) or last year discount is a good option (around end of august/september). When searching for best deal in Europe, it's not uncommon to find new formula sail from last year or 2 years ago which can become very cheap (-50 to -70% discount) while wave/freeride/freerace sails still remain pricey (-30% discount). Just shop around...
Otherwise if budget is a serious issue, a Gun XR 10.9 m2 sail + 550 cm Gun Select mast combo (or Booster 10.5 m2 sail + 520 cm Expert mast combo) will cost less than a sail only with other well-known brands.