I just installed the PacBrake Air Springs and really like them. Are you looking for a little lift in the rear or to keep it level when towing? If you are looking for a lift I would go with blocks or springs. When you air the bags up the ride gets pretty stiff. Even with just 20 psi in them I can feel the difference. I found the best price going direct through PacBrake plus they were local for me.
I have only heard good things about PacBrake and Firestone. The PacBrake are a little more expensive but not much. I think it really comes down to personal preference.
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