hey im new to metalworking and do not yet have a welder. i want to buy a mig welder and i need one that is reliable yet cheap, and preferably new or rarely used. i was looking at the websites and was thinking the HOBART handler 140, the MILLER millermatic 135, or the LINCOLN SP-135t. Also, i need a tubing bender that is cheap and was wondering how the sheiding gas worked and what i needed to weld steel and aluminum.