So, I've never used a wire feed welder. I can weld real well with a stick though, so does this mean I would probably be able to use a mig? How do the gas bottle deals work? I can buy or rent? But it's better to buy my own tank? Do I just take it in for a refill? How long will the gas last(hours of welding)? How much $$$ to refill? Most of the stuff I weld would be 1/4" and 3/16" and sometimes 3/8", but I would occasionaly want to weld body panels or exhaust pipe. I'm thinking of a Millermatic 175. I can get one locally for $736 including a cart. Will this welder be good for what I want to do? Is it a fair price? http://www.millerwelds.com/products/mig/millermatic_175/ .