i got a mig mate 130 turbo, more than good enough for car stuff. halfords sell them any they aint to expensive.
but if u can get into some where like maccess or any trade shop you can get them really cheap, and the gas is only about 4 quid a bottle aswell. (about half halfords)
a decnet welding mask will help as well, the ones you get with the welder is pretty cheap and hand held, it helps to have both hands useable.