I would quite like a model of R190V router with a built in transformer and powerline PLC module.
This way if a customer calls up asking for extended wifi coverage, we just courier them out a single wifi+plc unit to plug in at the other end of their house, rather than a powerline extender pair which creates more mess of cables at the router end.
Also passive 24V POE on the wan port with centre /blue positive would be good too.