I currently sail a Hypersonic, and have sailed the ST93 a fair bit as well. There is no doubt that given your weight and intended sail range that the ST93 is the way to go. As far as being technical to ride, I would put it another way and say that as with any board, give it time and experiement. I have found it also extremely quick off the wind, just as quick as the Sonic 100 I used to have, and way easier to gybe.
On another note, and would suggest trying a Hypersonic 111 or 96 for your light/med wind solution. It will leave that Screamer ( no disrepect to the board ) behind. You will find it plains earler, goes faster on all Points of sail, and trucks upwind at speed better than any other board ever made. Givce it a try you have nothing to lose.