I’m in the same situation as you: I prefer to use an all-in-one solution (only one router) and I’m searching for 1000mbps device. In the end I’ll wait for the new Netgear RAX120. It should be capable of QoS at 1gbps and OpenWRT support is not far I hope, here’s the discussion thread: Adding OpenWrt Support for Netgear RAX120 (Nighthawk AX12)