What router specs do I need for linked cabs?

[BadMouth]

My twin cab project should get rolling soon. 

This is the router/cable modem that I have for everything in my house:
http://www.amazon.com/Motorola-SURFboard-Gateway-SBG6580-Wireless/dp/B0040IUI46/ref=sr_1_2?ie=UTF8&qid=1375455399&sr=8-2&keywords=motorola+router

The wired connections are gigabit.
Will that be ok, or should I buy a dedicated router or switch just for the cabs.
Will just a switch work for connecting the two cabs? (I'm dumb about networking stuff)
At least one will need to be connected to the internet for Steam games.


I'd like to know the best possible setup so I can it right the first time. 

[SailorSat]

Any router should be fine. Arcade Games didn't use too much bandwidth and the newer PC racing games used to be dial-up compatible.

[Fursphere]

Any 100/1000 MBps router/switch combo > Cable Modem / DSL Internet connection.

Your bottleneck will be your ISP, not your router. 

If you can login to your router and enable port forwarding - sometimes that's needed (not so much in recent years though)

[ant2]

Can you move the cable modem router? If so you could plug them both in to that.
Otherwise if you have a spare network card plug the extra in to the pc that needs the internet and you can use a crossiver network cable between the two.
Otherwise any cheap switch. Evrn a 100mbit on ebay for pennies would be fine