The Shadow is awesome for waves - super soft, light weight and has cut-outs on the bottom so you can move your lower body...
I've ridden with a Dak Pyro and it's super stiff - wouldn't be too good in the waves at all...
Dakine Renegades are good - it's REALLY soft and doesn't quite have the finish that the Mystic does - plus the clicker system is awesome on all Mystic harnesses.
+1 for the hummer. I use mine just for freeriding and it will freely rotate around if you want to ride toeside. Super wide and comfortable and really well built.