ryanm,
Scooby is right to ask where you are from. There are only Nacra F17s available in North America used (I think there was one N17 sold in Florida and one in St. Croix). The used F17s have been selling almost as quickly as they show up on the market and the prices vary by the year it was produced.
The F17 is raced single-handed, however, I have sailed two-up and the boat handles the extra weight really well. There is an optional jib kit for the boat, however, the jib is not legal for class racing.
The most active fleets for the F17 are in Michigan (CRAM), Florida panhandle, and New Jersey shore. There are boats in Minnesota, Texas, Georgia and up and down the Eastern Seaboard. One design racing the F17 is best in CRAM, and the F17 fleet numbered 14 boats at the last CRAM Regatta.
This boat with the spinnaker and carbon mast (F17) is a riot to sail! You can hear many people expound on the wonders of spinnaker sailing, and it is no different with the F17. It is a fun boat going to weather, but the real excitement for me is under spinnaker, flying a hull and just ripping down the lake! this boat has been well designed for the single-handed racer. Things are well organized and designed with racing a spinnaker boat in mind. The way the boat steers and is so well balanced makes for a delightful racing machine that does what it needs to do and do it well. If you put down the tiller to do something else, the boat tracks relatively straight, feathering upwind (slight weather helm) with the just the mainsail deployed and falling off slightly (slight lee helm) with the spinnaker deployed.