My gut tells me there is an emerging niche for this type of product but no one has filled it. Cisco and Peplink fill the hardware needs but not the consumer-interface needs. Synology, Ubiquiti and Linksys fit the consumer needs but lack robustness and true dual-wan design.
This niche is filled very well by Mikrotik. I don’t even understand why you haven’t start with them.
They cover solutions for all sorts of needs, and the RouterOS GUI is enough to setup your n WAN links if you want (not only dual WAN), and supports OpenVPN also.
And for the speeds you’re looking at, you can get away even with a cheap $50 router they have on offering.
In the end, if you need in-depth control, the CLI is as powerful as a Cisco iOS, with some missings or addings here and there.
And their online documentation is in general detailed and exampled enough, that covers any general requirement. Otherwise, just ask on forums.
And for people searching for a serious 2xGigabit WAN router, try the Mikrotik Ah1100x4. 7.5Gbps backplane speed, holds pretty well for any kind of household requirement.
On a final note, I personally just ordered a hap ac2. Especially for home, to be able to saturate a 1Gbps Fiber link. If anyone is interested how it goes, let me know.
Cheers!