Spinnaker + self tacking jib is the simplest, fast boat. You'd be pretty close to F-18 performance up to 15 kts of breeze downwind with that setup. Upwind it's tricky, the F18's have much better foils, stiffer platforms, modern masts etc. Trouble is the self tacking bit is difficult to come buy used and expensive new. Worth every penny IMO, having raced boats like the N20 (more modern 6.0) with and without the self tacker.