If all you are going to power is teh 200DX, you don't really need a 50 amp outlet.
I was going to re-do teh power out to my garage until I measured the current for my 200dx....now I just run a 10awg SOW extension cord from my dryer plug in my basement out to the garage....I believe it is abotu 110-120ft of 10AWG and it doesn't even get warm. I have yet to tip a breaker (30A) and cannot detect any temperature change (by hand) on the cord.
I know it sounds odd, but that is all it takes. You could just use a 10awg extension cord and cut off the ends to run teh welder wherever you want.
by the way, I have a full 240V (242 actually) which does help a bit on the current requirement.
Everlast 200DX
Everlast PT185
Shoptask 3-in-1 (not currently in my garage, but I own it...)
Any day on a motorcycle like this that ends just needing parts and labor is a good day.
4.82, 158.67mph 1/8th mile 7.350, 200.35mph 1/4 mile