I ran EMT conduit on the surface for all my lights and outlets. It's alot easier that pulling wires through insulation in the walls and crawling around in the attic. I installed a surface mount subpanel for all of the garage circuits.
I bought a compressor for the same amount that appears to be about the same age and size. I was able to open up the drain plug on the one I bought so check out how much sediment had accumulated in the tank.
I have both a small MIG for sheet metal and a TIG for other stuff. I have been very happy with the MIG for body work. Make sure you got with a wire designed for body work. I use a produce called "easy grind" that's an 0.023 wire that has a tensile strenght of only 25000 psi. This grinds...