Do you have a pressure washer? This is another option. You can get an
attachment to blast with water. I haven't used one, but have heard
they are really nice. The water keeps the dust down, and the water
also helps to cool the metal to reduce some of the potential for
warpage on thinner sections.

Surplus Center has one in their catalog for, I think, around $150. I
have been planning on getting one, once it gets warm enough to leave
the pressure washer hooked up and not having to worry about things
freezing up on me overnight.