I would suggest that EVERYONE needs a portable/generator welder, right??? Look for one like a Miller Legend that runs at 1800rpm and it will use a LOT less fuel than, say, a bobcat. I have a bobcat, it was cheap, it does what I need it to, but it screams it's head off at 3750rpm and is fairly thirsty. No complaints for the $440 I paid for it, but I do keep my eyes open for something else.
I have the same Northern Tool Generator mentioned above. It works good. I use it to charge batteries in my garage power system right now, it has served our house when needed too. I live full time on solar/off-grid. We don't mind it, but it will not likely be a cost saving move for you, it would be an entirely dead end investment in your case. That begin said, fully off-grid right smack dab in the middle of town is becoming more common these days. Power service ain't cheap. We are on solar because bringing power in would likely cost us $50 g's.