I'm with the masses on this one, stick with the name brands, miller,lincoln,hobart and wire gas only no rosin core spools. No offshore equipment.
Another thing you need to consider is that welding of cromoly tubing is not allowed with a MIG by NHRA, it must be welded with TIG. So with a mild steel cages mig or tig is O'K.
At our shop we have a Hobart, mig and a lincold tig, both work well with our operation (Plastics injection mold building) i personally have a miller tig that i was lucky enough to buy complete with accesseries including work bench and vice for $600.00 from a mold shop that was closing, but again i was lucky. 20% duty cycle is enough for the home welder, that simple means that you can weld 12 minutes straight/none stop before you have to take a short break. In 12 minutes you can weld a bead from front to back on the chassis. Most good migs will cost you around $1,000.00, but you won't regret it.
I would watch ebay, something will come up in a week or two. Below is the one i bought for $600.00.
JMO
Zip.
