40A is a good power level. It will run off the same home 220V power as most welders.
I have a Thermodynamics Cutmaster 50. A friend who is a welder for a living with Empire Machine had another name brand unit at home. Plus the ones he has at work. He regreted buying his (sorry forget the brand) as he prefers the cuts from my Thermodynamics.
Consumables are an important factor. Not only the cost but the rate of wear. A coworker has a China special that he uses to build derby cars. His consumables are cheap and even double sided. But he goes through them 10x faster then I do. There is value in quality. I bet he is up to the total cost that I have spent, he just spent is in consumables.