Based on our new router research we are edging towards recommending the Xiaomi Redmi AC2100 as a replacement for the Western Digital My Net N600. The Redmi AC2100 costs around $40 shipped.
The major downsides so far seems to be that it requires a small exploit to flash it and that is only supported by OpenWRT Snapshot but hopefully that will change
Notes on installation are here.
Screenshots of navigating the Chinese language menus are here: File:Xiaomi redmi ac2100 router screenshots.tar.gz.