United just bought John Deere. I hope they're good because I'm on them.
Cigna's got tons of offices a few blocks from here...I've heard good things.
To be honest about it though, no one knows if the companies are good or not. It really depends on your employer and the deal they make. If you work for a small company, you're probably going to get hosed because group insurance is based on the number of participants. Of course, depending on the business, it could go either way for you. The real question is what does your preference primary care physician accept....