Are you aware that the further down the price tag & time-line you go
the HEAVY'ER the machine is likely to be?
ranging around what 350 400lbs. for a DialArc to 965lbs.
for my good Ol' Linde UCC 305. Miller AP/B 330 around 700 lbs. (estimate).
Even SyncroWaves I think go around 500lbs. for the 350.
Not trying to knock you off the sent, just pointing out the
"Tonnage" you might need to handle...........
There are advantages to old-tech.
I have a Miller AP/B 330 from 1968 that still works 100%
And a friend has an even older Miller AP/B 230 that still works.
Both are even selenium rectified.
Machining (metal-working) works when one sees the end result,
and identifies the conditions, situations, and interactions, he/she
needs to account for, quantify, quallify, monitor and controll!!!!
to get to the end result!