Product choice - Small Office Router.

I'm looking to recommend a new small-office router to a client in a region where not every first-choice of tech is available; I therefor need 3-5 'top picks' that they can choose from based on kit availability.

Does anyone have either:

Suggested websites that have useful feature filters / searches to look for what I need or Direct suggestions for good small-office routers which hit the following requirements:

• Strong Wifi range with b/g/n (client kit is all pretty old so ac isn't likley needed)
• Dual WAN connection management with bonding / failover options
• In addition to Dual WAN connection management (ethernet, doesn't need to terminate it's own DSL or anything), ability to also add on a 4G / LTE connection, either with a SIM slot or with native support for a USB dongle.
• Support for 802.1x

• All the usual expected stuff like Bandwidth management rule options, DHCP & DNS server, Guest wifi, multiple VLAN support etc etc.

  Don't worry too much about vendor support contracts, pretty much none of them support in this region properly, but expected (not necessarily guaranteed) security & functionality patching availability for 2-3 years minimum would be a positive.

  Thanks in advance for any pointers!