for 1/2" get the ingersol-rand 2135Ti (ive got the QTi model, its quiet). The ingersol-rand 38 titanium is nice but i use a Snap-On MG31 and its very strong, you can even do most lug-nuts with it.

I try to not go by ft/lb ratings. On cheaper guns the manufacturers typically fudge the specs, but in all actuality they are weak