There are plenty of homes for rent in Duluth and Suwannee in your price range. All single family, detached - many in swim/tennis subdivisions.
I can send you a list of what is available. My email is: Jennifer.Ashtar@bhhsgeorgia.com
What are the ages of your children? Chattahoochee, Walnut Grove, Harris, and M.H. Mason are all highly rated schools in Duluth and Suwannee. Check GreatSchools.org for more school information.