The N17R/F17 can handle your weight. There were a couple of guys in MI (CRAM) that sailed the F17 with an optional larger class spinnaker. The boat can handle up to 340 lbs.

Ideal for a heavy-weight single hander. There maybe a couple of used ones coming to the market. Check out www.nacraracing.com for details (class rules for optional larger spinnaker). If my attachment went through I believe that the green I17R has a larger spinnaker.