Mark if it makes you feel any better, the house I'm in cost me $325K. The previous owner had painted over a ton of mold in the downstairs/walkout basement area. And naturally lied about it, and pretended to have not known about any mold. He is apparently one of the area's 'elite' custom home builders (choke on my own vomit). I have repairs in the sheetrock around the showers which were made with huge globs of silicone and painted over. Many other things, but probably the worst of all was when he poured the basement walls, there was a large air pocket about the size of a football at the floor level. You can see all the way through to the dirt on the other side. He built a wall over the top of it and every time it rains, water leaks in. Over time, the entire base plate had rotted to nothing and mold was rampant.
It's been a voyage of discovery at my house. My agent said I've got a pretty good case against the former owner...but I'm just focussing my attention on fixing it at my expense. I had to replace 5 external doors to the tune of $6K, and next project is digging a rubble drain in the basement to the tune of $3K. After that, who knows?
It's tough. Every house I've ever bought, the owner has lied through their teeth with obvious things. A sellers disclosure is not worth the paper it's printed on, with the exception it may have the gas company's phone number on it.
And then, when I've been honest and open about stuff during selling, people have threatened to sue me. Even a lawyer who was buying my house wanted to sue. He must've been a big shot, called himself esquire. But a carefully worded letter back to him and never heard from that bully again.
I don't think you've got much hope of litigation, since you did tour the house before buying.