No US dealer for the Spitfire, and they are quite expensive, especially with the current euro exchange rate. There are several alternative boats that would probably give you what you're looking for.

Inter/Nacra 17
Blade 16
Hobie Fx-1
Taipan F16
Stealth F16

The first four are available in the US and have dealer or manufacturer support. Which is best for you depends on whether you like lightweight or heavy boats, whether you will sail alone, with crew, or a little of both, cost, dealer support...