Kate, There are many Federal and State Laws that prohibit real estate professionals from answering your first question. This article may help explain more. http://realtytimes.com/rtpages/20020110_fairhousing.htm
The State of Michigan provides a property Tax Estimator on their website. https://treas-secure.state.mi.us/ptestimator/ptestimator.asp Please read the disclaimers on the State of Michigan website. You will need the correct school district to estimate taxes for each home.