When I wrote that on my website, I was very new and learning the hard way. The HARD WAY couldn't be more true when starting with an HF 80 gal pressure blaster. I simply started with a 1950 frame with the full intent on doing everything associated with the entire truck. I didn't get past the 1st crossmember before the valves were trashed, the hose had holes in it and the nozzle was toast.
To this day I LOVE my HF pressure blaster. But with all of the changes I had to make. Goodyear high pressure hose, carbide nozzle, water trap, better shutoffs, etc. My personal opinion, which is about the same as asking a brick wall, would be that any of the companies you mentioned would take your money, but you would end up having to make the very same changes. I buy stuff from Northern and Eastwood, and the differences are... wait for it... there aren't many!