Get trekkers if you're not touring very far, like say an hour, half a day at most spent with the trekkers on. They're heavy and as the day goes on, you'll find it harder and harder to keep up with people who have touring bindings.  If you plan on just going out and skiing some good pow without any plans for big drops, then you'll be fine with a light pair with a din of 10, but if you're planning to find some hits, then you'll want a good pair with a din of 12. Fritchi freerides are the be best imo.
If you plan to hit kickers, get trekkers. Touring bindings are made light, and thus aren't as strong.  They also don't release as smoothly as regular bindings.