I never felt the need for a plasma cutter until you guys started talking about them. Now I'm in the marker for one.
Just a piece of FYI for those few people who might know less than I do about them:
A "good" air filtering system costs about $100, with replacement cartridges at about $5 or $10. i think I have seen some filters or filter/regulators for Plasma cutters going for $200.
Also, as my son the welder pointed out, Ebay has all sorts of "deals" on consumables, especially if you buy a bunch at a time.
So far i have learned that there are torches that use 2-part, 3-part and even 4-part comsumables.
Not sure how this applies to overall cost of operation, but it's something to think about.
Also, just so you are not surprised, some of the dual voltage models appear to come with no power plug at all. You install the plug you need for the voltage you choose. Not a show stopper, but something to think about if you plan to change input power sources often.
Others, like the Thermal Dynamics Cutmaster 42, come with plugs and adapters.