Mig welder questions

When I was looking for a welder the Lincoln welders I found at Home Depot and Lowes had click voltage settings instead of infinitely adjustable knobs. You don't want those. The box store version had plastic drive parts where the the wire drive in the welding supply version is a dual drive solid block of aluminum, and the circuit board is completely sealed in silicone vs on top of the board. There is a reason they are cheaper. But if all you need is the cheaper version.........
My Dad bought a SP125 years ago and we ran countless rolls of wire through it without issue. (We did have the voltage control updated to continuously variable at the welding repair shop though. They had a parts machine so we could have them swap a few items without too much expense) Just make sure you get a setup that can run gas if you plan to do any light metal work.