When I was setting up I asked for advice on this very subject and was advised to buy a Trinco. They come in every possible shape and size, are built like good old school American tools, super sturdy, parts are common and cheap, etc. The dust evac is key - it takes much of the spent media right out of the cabinet in the air and that makes for much more consistent results.
If you're going to use it a lot I'd hold out for one of these, new or used. And a dryer for your air - that is crucial for production work.
N.