I was in their shoes once, and it was a horrible experience. I had paychecks bouncing at the end, some tempers flaring, and overall was about as miserable as could be. I'd suggested that people start looking for other jobs - there was no turnaround in sight. This was just a group of 5 of us - not some huge office, so we were closer (physically, if nothing else) than some other larger orgs that have gone through this. To their credit, they stayed as long as possible, later than was probably prudent. That may have been partially due to the fact that few others in the area were hiring at the time.
Answer, you can try to sue, but there's probably very little chance you'll get your money any time soon. Whether you
want to pursue this or not depends on a few things. Do you feel they mislead you? Do you think they really have money and are just lying to you?
The flipside of my experiences was about 4 years after that scenario above, I did some contracting with a company - remotely (unfortunately) and they didn't pay. I found out from discussions that the PM on my project quit soon after I started, another developer on the project quit as well. He'd told me he'd quit because he was tired of the contractors bitching to him they weren't getting paid - apparently this was a habit company X had. I had other contractors seek me out and tell me they'd been shafted on payments too - one for $700, and another for $3500. Mine was to the tune of close to $9000. (never again!). So... I drove up to his state and filed a lawsuit. It's been > 2 years, and it's still in the system. Will probably take another year, and at that point, I'd still have to collect. At this point, it's a matter of principal - the company's whole MO was to farm out work to contractors in various states, then not send payment. That's a whole other level of evil, imo.
But maybe I'm biased and I really was as scammy as the guy who didn't pay me? I don't think so. I was honest with people - there's no money coming in - take another job if you can get one. That's not what happened to me a few years later, though perhaps some might see it as divine retribution?