I bought a Hypertherm Powermax 30 after my boss bought us one at work. It'll cut 1/2" if you go slow, it's small, very portable, cuts a very fine line so it's great for sheet metal and it runs on 110 or 220. I got the deluxe model that comes with case, shoulder strap, circle cutter and some extra consumables. If you search around on the web you can find a new one for about $1000.
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