If AC1300 is enough wifi for you and you don't need to shape a gigabit, the Linksys ea6350 v3 with @notengobattery's outstanding optimized build is a startlingly good device which can easily be found for <$30 shipped on ebay. Quad-core 718GHz cpu, 256MB ram, 128MB Flash, dual-firmware, and USB3, which I've tested with a dual Realtek ethernet adapter -- it'll handle a gigabit by itself without taxing the CPU. He's fixed the switch oddness so it can be configured properly in luci, and just generally unleashed all its capability with dozens of well-thought-out optimizations. For anything up to a 500 mbit WAN installation I wouldn't hesitate to recommend it. Also pretty awesome as a NAS, just plug a dual-drive USB 3.1 enclosure into it.
Qualcomm almost got it right with the IPQ4018; unfortunately the internal bandwidth between the CPU and switch/phy/usb is a bit too narrow for routing much more than a gigabit aggregate in both edge and LAN. A great pity because those cores are capable of doing a lot more work than those inexcusably narrow back channels will let it do.