i jsut bought the biggest one that harbor frieght sells, and let me tell you, it is awesome.
well, it was not great at first, cause i had no filtrations system for it. and when you use it, it builds up pressure inside from the air, and it lets the blast material out of every seem. especially the side door, and the front glass that you see out of.
so i devised my own air outake system. i took a old vaccuum cleaner that i had, and put it ouside my building, and then ran the hose right to the spot for it on the cabinet. now when i do sandblast, i can see now cause there is not alot of dust in it anymore. and also, now i have no issues with it leaking out the/any seams.
i paid 250.00 for it and a 50 lb. bag of media blast