For that price you -might- be able to pick up a used Nacra 5.5 Uni rig, w/trailer, then add a spinnaker.

There is a classified section above you can look at for prices.

Of course, if you want to race in the Tampa and Melborne area of Florida, that is where a lot of Blades (F-16's) are located, but they being so new, will not be in that price range.