OP: I just switched from Comcast to Quantum fiber. As a result, I have a Synology RT2600ac router and an Arris Surfboard SB6183 modem just sitting here unused. If interested, shoot me a note with an address and I'll send them to you to see if it meets your needs. At the time I bought them, the modem was on Comcast's approved equipment list, and it all worked fine for streaming.
