I'm on the same region, I'm playing grand haven as a high/med wealth residential city, the next one along will be similar but concentrated around education and the next one down I'm going to do tourist city.
Because I'm doing 3 high/medium wealth city's I'm building up cinder as a utility's city to avoid pollution in the other 3. I have at the moment 2 sewage plants, 2 power plants etc etc and a crap load of garbage trucks. I just sell power, water, treatment and volunteer vehicles to the other 3 city's. works quite well.