Kind of funny when I'm posting advice in a question thread that I originally posted
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Anyway, I bought that $100 unit you posted and it's terrible. It does get the job done for not much money, but I'm constantly having to pick it up and shake it to get the beads unclogged because of the cheap suction fed system (I'm thinking about jerry rigging a gravity fed system).
EDIT - also, make sure you get a compressor with close to the same CFM as your blasting cabinet otherwise you'll have to wait all the time for your compressor to regain pressure.