I love TP-Link Gear. Solid, reliable and inexpensive. And if you don't want Wireless at all, then this is a good option.
Spec sheet here:
Quick Install Guide here....
The Cable modem will plug into the WAN port on the Router, and your PC and the Flex will take a LAN port each. This will leave you with 2 free network ports - so you can add another PC, a SAN or perhaps another Flex 6000 down the road.
Using the Router will allow you to access the internet while also using the Flex - great for QRZ lookups and software updates .