I've spent more than a small amount of time today pondering over this very topic... I don't have 220 in my garage, (LOL I don't have a garage :rattle: ) but the clothes dryer plug is handy to where I'd be doing most of my welding until then.
The bux-up choice would be an 'invertor' type stick/TIG unit, such as the Miller Maxstar 150 STH... very portable and pretty strong. It is also multi-voltage, so if you can plug it into 220, it gets more efficient and more powerful, but it will also plug into 110v. NOT cheap at $1750, but at that price you get more features, plus the TIG torch & gas regulator. If you are into Red vs Blue, the Lincoln V-160-T is similar. The only big drawback to these are being DC only... if TIGing aluminum is in the future plans, look elsewhere for an AC/DC rig...
Another 'highly portable' option is the ReadyWelder II: all ya need is one (or a pair/trips of) 12VDC automotive batteries and weld away. It's a 'spool-gun' wire-feeder that uses small rolls of flux-core wire... so the gun isn't as compact as a typical remote-fed wire feed gun. It also lacks the controls that a typical plug-in welder has, like adjustable amperage & wire feed speed. Approx $470 at Northern Tool...
With electric wire-feeders (115v or 220v) generally speaking, more $$$ = more features. For example, the Millermatic 135 at $700 has variable amperage & 'automatic' wire speed adjustment, the similar Hobart has a fixed # of preset amperage settings (for approx $300 less.) Both the above run a little over 60#, in an approx 1.5' square package... so they are somewhat portable.
With the smaller welders, bumping into the (typically low) duty cycle could be a hinderance for some folks... others may rarely have an issue with it.
Which one would I pick? I am leaning very heavily towards the Miller Maxstar and learning to TIG weld. Anything I'd need to do out in the wind, the stick function can handle it, and once I get a shop built, hook up the gas. OTOH I've seen first-hand where a Ready Welder (or a vehicle mounted Mobi-Arc stick welder) on the trail is a handy item... the kit plus a pair of good batteries isn't a bad investment.