ive bought decent mig, tig welders from liquidation sales and local tradeit papers, better to get a second hand slightly larger mig thats maybe a little older but with decent torch and proper duty cycle imo
small inverter welders are great but unfortunately any with realistic duty cycle ratings are lots of money, dont be fooled by high amperage figures from some cheap plants as they are often at very very short duty cycle with long cooldown periods
id go take a nightclass and get an idea of wot you really need first, then take advice from your tutor, instructor