Gix, Ron is right. This site is loaded with info such as you seek. Use the 'Search' function and just start entering key words in.
While we're here though, there are as many answers as there are welders on this forum. Lincoln is a good choice for everything you mention. You may want to get and go through a equipment sales book from Lincoln or check them out on the web. Also, check through some posts here on truck pictures.
Gotta go, customers needing attention. Always a good sign.
Have a Great Day, Brent
Before You start looking at machines, decide if You need AC tig or not. If You need AC welding output You have fewer machines to choose from. Keep an eye out on Craigs list and eBay for used machines. Since You dont need one "right now" You might find a good used machine for a lot less than a new one.