Hi Bas,

You could also take a look at the Nacra 5.7 or 570.
This is a good ship without swords which makes landing on the beach more easy.
You can sail it alone and wit a crew, and has more distance between the water and the trampoline than the Dart 18.

You can also vist Jan de Boer Catamarans for a honest advise, ask for Bas.

you can find them @ www.jandeboer.com

Or vistit the next big cat event at Hellecat (hellevoetsluis) www.hellecat.nl

I am sure people there will give you all the advise you need.

Good luck