I use the miller 252 and 252 at work daily, and I own a hobart 210 personally. I've run many different wire and stick welders, and I'll throw one more Towards the buy name brand team.
When it comes to spending money on a welder, you most definitely need to consider the lbs of wire the machine is rated to run. Some can make it 200 lbs before things get saucy, while other machines are designed for tons of wire. I have burned over 800 lbs of wire through the 252 building up a concrete crusher rotor and excavator munching attachment, including hardfacing and spray arcing gravel trailers during frame down rebuilds. I'm only one of many who use that welder, and I'm sure it's burned at least a ton of wire so far. I can promise that you have to pay up front for that kind of performance. Good news is that money is easily accounted for in how much longer it lasts and In the value they will retain over chinese goods. Plus, it doesn't hurt that basically every welding supply services the big 3, so if something were to happen it could actually be looked at in a timely manner. The same can't be said of the chinese made units if you have to ship them back because of sub par manufacturing. People have spent more on low quality machines and shipping than they would on a one time purchase of a quality machine.
Lincoln just released a machine called the 210mp. This is a multiprocess machine and will do stick, mig, and lift start tig for a pretty fair price of $1k. It's new to the market so there may be some bugs that need to be worked out on the first production run, but it looks very promising. It sounds like a large investment, but I've never regretted spending that much into my hobart.
As the count said the older machines such as the mm200 are good to keep an eye out for, but many people know how solid of a machine they have and ask high prices for them. Use a good search engine like searchtempest and you can look as far as you are willing to go. I went 4 hours for the hobart and 4 hours the other direction for a plasma cutter. Factor in gas and time and even those trips were well worth it for the deals I received on USA made equipment that should outlast my uses for them.
Good luck,
Justin