I use a Matco MIG welder 110volt unit. I run 80% argon bottle.
I got the unit used from a welding supply dealer for a great price. They get trade-ins all the time from small shops who upgrade. They do not really want the old units so just poke around and you could save a few dollars.
If you go new, Miller. Nothing more to say.
What I would not do is get the cheap Lincoln WeldPak 100 and add the MIG part later. Why? Because the inner coil does not put out a large output of usable amps per the power it consumes, basically it is not very efficient. If you like Lincoln just get the 110 to begin with. Really all said and done they come out close on price and you have a nicer "motor" in it.
Also I am a big fan of hot and fast welding. When it sounds like you are "frying bacon" you got it right. Also use baby circles to keep your puddle going forward. Remember that the metal needs to be hot so it can fuse together. I really think a lot of people who tack weld it in are not getting a good seam. Just keep the welder moving as if you sit it will burn through.
And remember that grinding is easy, so let her rip
Once you can weld (even poorly) it is more addictive than crack.
Plan on an extra $150-200 for gloves, helmet, wire and other miscelaneous stuff.
Go to fabrication shops and pick up scrap metal to practice with, free. Just leave the galvanized stuff alone!