MIG is great and very user friendly. A nice 220v machine will be able to do everything you're asking, and some of the units these days are multi-purpose MIG/TIG/stick. Miller makes great products, and their price tag reflects it.
I currently have a 110v Northern Tool welder. I plan on replacing it with their 220 Multi purpose welder one day ($600ish) unless I find a smoking deal on a miller
Practice, practice, practice. I haven't taken any classes, but I would like to some day.
Add a plasma cutter to your collection if you plan on fabbing any replacement or custom parts yourself