Preheat a gas grill over medium-high heat. In a mixing bowl whisk together olive oil, lime juice, ancho chili powder, cumin, onion powder, paprika, coriander, salt and freshly ground black pepper. Evenly rub mixture over both sides of salmon (I placed the first one on the plate then began to stack the rest over it so the rub didn't all just end up left behind on the plate). Brush grill lightly with oil, place salmon on grill and cook, rotating once halfway through cooking, until cooked through, about 3 minutes per side. Meanwhile, prepare avocado salsa.