Wisconsin non-compete

I signed a non-compete agreement when I started with company "x" in 2000. Company "y" bought company "x" effective on July 1, 2005. In order to stay employed with company "y", I had to sign a new non-compete agreement. It was signed on June 28, 2005. There is no geographical limitation stated on this agreement. There is not even a mention of geographics at all. Then in June of 2006, I was let go from this company in your typical "downsizing" effort to reduce labor costs. I was given a standard severance package as long as I signed another agreement. This agreement was pretty standard on the confidentiality stuff but does not have specific language about the 2-year wait for being employed by a direct competitor. I have been working for a non-competitive company for almost a year. I now have an offer pending from a competitive company for a lot more money. My questions are: Are any of the agreements valid and if so which one? What is the worse case scenario for me if I accept this job? How has the state of WI ruled on non-compete agreements in the past? Should I go to company "y" with my findings and ask to be released of these agreements?