Hypertherm just released a new product last week...it is called the Powermax45 and is rated at 3/8" for piercing and production cutting....it will do much thicker than that with edge starting.
Here is a link:
https://www.hypertherm.com/powerfulplasma/
It is the latest generation torch design (both hand and mechanized quick connect torches available....with cnc interface standard.
Jim