ORANGE PI  R2 could be the next low cost / low power / compact personal firewall for computer enthusists (and home users alike).

Recommend specs -

CPU:                        H5 Quad-core Cortex-A53 64bit
Demo Board Type:                        ARM                     
Memory (SDRAM): 1GB to 2GB  DDR3
Interface:                        TF Card Support,3 x USB2.0                                       
(2) Onboard Network:                        1000M/100M RTL8152B                    
Onboard WIFI:                        Realtek RTL8189ETV, IEEE 802.11 b/g/n
Supply Voltage:                        5V                    

For Opensoure projects such as Ipfire / Pfsense / OpenWrt / Endian / Untangle / Monowall / IPcop and more

Good try, but xunlong will made another trash half-board with usb-to-ethernet converter and 512 mb of RAM
Instead, it will be cheeeeeap.

Onboard switch and eMMC would be big plus.

8G eMMC is more than enough for a router. 1GB or even 512MB is enough if it's cheaper.