Stick with 7 or 8 power binos with an objective lense between 36 & 42mm. This power range is an ideal ballance between magnification, brightness, weight, and a steady hold. 10X is OK but anything more is dificult to hold steady. As you go up in magnification you need ever larger objective lenses to get good light gathering abilities and this will add signifigant weight. Glass is not light.

If you need more magnification than that you need to get a spotting scope.