About $15000 Aussie dollars and in my experience the Weta doesn't perform around a race course anything like the cats mentioned. Nacra 5.8 is a top choice, you could use one of the old small jibs so the kids can pull it on
Jeff Southall Current boats Nacra 5.8 1703 Animal Scanning Services Nacra 5.8 1667 Ram Raider Nacra 18 Square Arrow 1576