Dear Canibul, concerning Windrider 17, a Jim Brown design and very well thought of, but I hope the Stateside prices are cheaper than the European, where European Hydrosail Systems were quoting euro10,000 for the boat with trailer
and basic accessories a while back.
You may find a couple items on the Tremolino boat company's website of interest. Obituary of the founder, John Olin, which mentions him borrowing a Windrider 17 and winning a race
with it, all within weeks of his death at 76 (!) also an article on quick getaway sailing in general and his Tremolino in particular by a guy called Ed Haile, who lives in Essex county Virginia. As a Hobie sailor I guess you'll know all about Tremolinos.
Best wishes - John K.