Definitely get the traveler if you want to control sail shape in high winds. I find that it makes a huge difference in sail control.
A boom, along with a traveler, would be even better, performance-wise, but the Wave main is not designed for one. At least not the typical Hobie style boom. Not to hijack the thread, but I often wondered if anyone has ever considered taking a H14 main and having it recut to fit the 2' shorter Wave mast. A H14 boom/gooseneck should fit, as the mast is the same extrusion. It would probably give you more sail area, even recut. Ok, now I am just babbling nonsense.
