Michigan USSSA has several outstanding tournaments in 2006 that teams, from the Midwest, are already sending in their registration forms for. Take a look at
http://www.michusssa.com and you'll find some very good tournaments that your team could try to get into.
Most 17-18 year old USSSA tournaments are played at college fields with a good representation of college and pro scouts usually in attendance. There are also several tournaments in Battle Creek Michigan that will fill up fast because of the competition and the excellent facilities.Sorry to hear you don't think there's much to pick from in Michigan but not sure where you've been looking.