The biggest thing is to use a plasma machine that you can get differnt heads for. I've seen some nice work done with a hand held trigger mounted on an adjustable mount and I've seen crappy cuts with a dedicated machine head with bad tips.
This one has a roller-ball style mount for a table-style tip to be inserted into, but that could easily be changed out.
We have used Hypertherm and ESAB units and both worked great.- both of those companies have several different options as their machines are designed for production use.
I have not had ANY experience with Lincoln or Miller units on one of these machines, but I would not rule them out.