Don't skimp and don't go flux core. You will regret it in the long run.
First buy name brand. That way you can buy parts and or have it repaired if the need arises.
I currently own 4 Mig welders and bought 3 of them new. I have an old Lincoln 150 amp 220 volt machine that wont quit. Plus a second one just like it that I bought used from a friend. I have a Miller 140 Auto Set machine that I would highly recommend to anyone wanting there first machine. You can manually adjust wire speed or click it to "Auto Set" and the machine will adjust the wire speed as you go. Just set the Amps to the recommended setting on the chart inside the lid and go to welding. Its as close to pre adjusted as you will get for what ever thickness metal you are welding. I also have a Miller 251 Mig that will weld 1/2 inch in a single pass that I use for everything except sheet metal. And I mean everything.
I have a friend that replaced an old Century Mig with a Miller 212 Mig and now wonders how he ever welded anything. It has the Auto Set feature also.
Here is a link to the new Miller 141's
https://www.millerwelds.com/equipment/welders/mig-gmaw/millermatic-141-mig-welder-m00486
I have numerous other welders from a Lincoln 300 amp AC/DC water cooled Tig/stick machine that I almost never use. A Miller AC/DC stick machine that I almost never use. A Miller Diversion 180 Tig machine that I absolutely love. Lenco spot welder for body panels. Miller Plasma cutter that is rated for 7/8th steel that I almost never use.
When I reach for a Welder I always reach for my Miller 140 Mig. Its quick and simple. If I am wanting to do more refined welding then I pull out the Diversion and do some Tig welding.
Shop the Miller 141 on line and you can find a good price. You might be surprised what you can buy it for from a local welding shop too.
When you get the new welder your first project should be building a welding cart for it. Good practice and a chance to get familiar with the machine. I would post pics of my carts but I have a dead camera and have no other way to take pics that I can use.
I live in the dark ages.... I still have a flip phone and am the only house in sight with an antenna on the roof.... :doah:
Spend a few more dollars now and have a machine that will last a life time with just 10 minutes worth of maintenance every couple of years.
You wont regret it that's for sure.
Doug