what is the least expensive welder i can get away with ?

My vote is for the 110v miller. Go to the local welding supply store. Most have stores in several cities so do your homework. Not always the best price but you have a door to walk through if you should need help. Try to find wire made in the US. Restoration guy at Carlisle last year said china wire pops and blurbs when asked about ugly welds. Wait if you have to but get the gas.