I am owning one of the few F18s which were derived from the Taipan 5.7. Although I reduced the weight as much as possible (I am not participating in F18 regattas), I am obviously not able to reach the approx. 140kg the original boat had. Therefore, I am always curious how a standard 5.7 might perform, not to mention the Super Taipan.
You might add me to your list of prospects.

Regarding regattas: You might consider Fehmarn Rund (around the island Fehmarn / Baltic Sea) which was this year in August - the date for 2007 is not fixed yet. An alternative is Travemünder Woche (close to Lübeck / Baltic Sea) which is in July, but I am not sure if there is a open catamarans class.