The Loft Switchblade(3 cams) offers the best of both worlds, lightness in the hands heaps of low end power and great top end speed, other brands with similar type sails KA Koncept, Severne Overdrive etc
pic 2012 Switchblade
I believe that sails around 7.5m+ really benefit from a couple of cams, and the sails these days are amazingly light with huge wind ranges.
Most brands have recreational race sails in their range, just a matter of talking to a retailer who knows his stuff....Good luck...