whatever you do DO NOT buy a gassless mig, just dont, and dont learn to weld on mot stuff it will fail! unless you are good straight off.
why buy gassless and make it hard for yourself as they are a nightmare, buy gass bottles, and if you do that much welding get a proper bottle.
dont want to sound totaly negative, but you can get some real crap advice sometimes, and i dont want you to spend a day messing about getting stressed with a welder, doing a crap job just to get a fail.