The Lotos does a good job, it falls into the "cheap Chinese" category but it's plenty good enough for what we need to do. One perk is that it runs 110 and 220, so if you're clever with the wiring you can take it with you to a friends house and use it on any outlet. It uses external air, which is IMO pretty much a requirement - given how much air my big compressor puts out, and it running constantly to keep up with the plasma, I can't imagine this working with an onboard compressor, the equivalent of a tire pump. But that's me being narrow-minded, obviously they exist and work fine.
Best part is the price, brand new $300 shipped if you watch Ebay. They perform fine, watch out for consumables though, they will take a bite out of your wallet (true for all brands). Be sure to have extras around because you're sure to mess up a few getting started.