Mark, the properties that are cheap are in neighborhoods that you don't want to invest in. A great deal of rental proprities are in need of repair. Some tenants move into your property and don't pay their rent and when you evict them they get angry and distroy your property.
The only neigbohoods I could possibly live in are: Sherwood Forrest, Palmer Woods, the University District, Rosedale Park, which has some really good deals at the moment, and if you like the east side, Indian Village.
I live in Farmington Hills, MI which is in the surburbs. I fled Detroit when my car was broken into twice.