Tools--is it worth it to buy a welder and if so what kind?

[Carrameow]

Among the specialized tools I own: a Vacuum pump , an air compressor , an engine hoist, several kinds of Pitman pullers, shop ginders

...All the tools pay their freight except for my investment in compressed air. It turned out I dont use air tools that much, you cant access tight spaces , they scare the neighbors ,and I only use the compressed air to clean when I am rebuilding engines.

---Would an arc welder turn out to be a similar boondogle? I dont need an overpriced toy. I plan to use it fix the rust pitting on the body on my 240D and do some exhaust work. I was really po'd when Mieneke charged me $60 for an exhaust weld--

If not, what kind of welder should I look at?

Tools--is it worth it to buy a welder and if so what kind?