Get a Mig welder!
I have a 280 amp arc welder, an oxy-acetylene outfit, and a mig welder. I find myself using the mig welder for over 75 percent of the welding I do. The arc welder is indispensable for welding anything 1/4" thick and thicker, and the oxy-acetylene outfit is good for cutting and brazing, but warps sheet metal too much. The mig welder allows you to weld sheet metal and tubing with very little effort and makes a very strong weld. My unit is an inexpensive italian unit that I bought 20 yrs ago for $350 or so, and has given good service.
'82 300D/4.3L V6