My small MIG welder, 135 Amp. I use a mix of 75% Argon / 25% CO2. It has a built-in regulator for gas flow. It will handle up to 1/4" stock adequately, which is sufficient for just abouit all of my needs. For anything heavier, I just visit my neighbor.
A fairly recent purchase. The small Victor regulator was bought from HF on sale. Also the cart. It's great for Silver Soldering, as well as cutting large, awkward pieces, etc. I found that I was replenishing the small $10.00 bottles of oxygen for the small Oxy-MAPP rig that I used all too often.