A used miller or lincoln will go a long way and if you ever need to sell it or repair it, you can.
Search craigslist and try to find one that Did Not come out of a Home Depot or Lowes becuase they put cheaper parts on those things. We see it with the dewalt products that we sell and the home depot stuff has plastic parts on them. Same exact Dewalt Part Numbers with different parts.
I have seen 110v welders with cart, bottle, regulator, etc for under $300.