Why not choose one with the Nexus (or Alfine) 7 or 8. And, coaster brakes if you wish (I know it is an option with the Nexus, but not seeing any coasters, perhaps it needs to be added as an aftermarket option).
Pure City Dutchi Step-Through 8-Speed Commuter Bike
2014 Breezer Downtown 8 Women's
Allston 1 | Schwinn Bicycles
For something even a bit more unique, perhaps a Nexus Shaft Drive bike.
Dynamic City 7 - Step-thru Chainless City Bicycle