Mostly light work around the house and for a hobby. I might plan on doing some exhaust work as well, but from what I understand, I have to use a stick welder to do aluminum, don't I? I think I read flux line Mig welding won't work on light alloys
No, you can you a mig gun, but you need an aluminum nozzle. Its hard to weld aluminum, but just practice and you'll get it.
Lincoln or Miller are the top machines out there from what I've read.
When you go to buy one, make sure you look at "The Duty Cycle".
That tells you how much use the machine can hold up to.
You have two options for wire.
You can use Flux, or non fluxcore wire.
If you use non flux you need an Argon tank hooked up to the welder. This is the way to go because the welds are cleaner and it won't look as dirty.
If the wire has flux in it you don't need a tank but it smells bad and the welds need to be cleaned or brushed off after the weld is complete.
Once you get your machine, you just have to play around with the amount of amps and wire speed that you need.
Be careful not to turn it up too fast or you won't have time to lay the bead correctly.
If you put too many amps on too thin of metal you cut through it.
It just takes practice.
I love welding, its fun to make stuff from nothing.