You should be fine on the 172cm. It will be slightly harder to turn but offer you more stability at speed. At your size I would also point you that way if you enjoy skiing aggressively.
For bindings I personally turn to the Look Pivots. They have been by far the best binding for me personally. I also ski a pair of Marker Duke's that I really don't have any complaints on.
For the record my favorite skis are Stockli's. I've owned a couple pairs out of the Stormrider series. My current ones are getting a little old now. But I'm on the 1st gen, Scot Schmidt Pro Models