Ah yes, the old tombstone. Thats what we always called them. I got rid of mine when I bought my first mig many moons ago. The AC/DC ones still bring a little money but the AC ones seem to be dime a dozen. They never die, just get new owners.
For Tig I have a Thermadyne 185TSW. My plasma cutter is a Thermal Dynamics Cutmaster 42. I also have a vintage Thermal Dynamics plasma that it replaced because consumables were getting hard to find.