As a hobbiest, I think "wants" trump "needs" most times when buying a new welder. I bought a ac/dc tombstone about 30 years ago. No telling how many rods that machine has burnt. A few years ago, I decided i wanted a mig so bought a new Miller 175. Ran a ton of wire thru it. About 2 years ago, I decided I wanted a tig capable machine, I ran across a good almost new 250/250 Idealarc stick tig complete withfoot pedal and a full bottle of argon. So I bought it. Soon I then had a shop full of welding machines. Guess which machine i still used most. Thats right, the old tombstone. I never even hooked the Idealarc up for stick welding until last week, I had to figure out how to switch it over from tig to stick to even run a bead. (Must turn off tig foot pedal control to do stick welding). You know the only reason I used the ldealarc for this project was because I traded my old tombstone for a SA200 that I am currently restoring. My point, for 30 years i got by just fine with the old tombstone, its what I "needed", everything else is just what I "wanted". Thats not to say I dont take advantage of having multiple welding machines, The mig is great on that thin stuff and tig I am still trying to get a handle on, But I got by for over 30 years with the old tombstone and the other machines are just the jelly for my toast.
I will echo the comments about CL welders. I bought a slightly used lincoln pro175 a couple of weeks ago for $150. Had a almost new 10lb roll of fluxcore wire on it. I bought it sight unseen and untested, and after I had paid for it, the seller admitted it didnt weld all that good. I opened the cover and noticed they had the polarity reversed for flux core wire. Got the machine home, changed out the polarity and machine welds like new. New mig machines normally shipped wired for gas and solid wire, if your going to use flux core, you need to swap the lead wires. Funny thing is, there is a chart right inside the cover that explains this fact, but nobody ever seems to read the instructions. No telling how many hobbest buy these welders, have problems with them simply because they changed welding wire and didnt change the leads, then sell the welders complaining all the time that the welder isnt any good.