Skip the second router, one will do fine. You've got to keep in mind its going to be exceedingly rare that you have ALL 3 laptops, and 3 wired devices at the same time.
And even then, as mentioned, any slow down is going to be due to your internet transfer speeds, not router. 802.11g can handle way more than I would expect you guys would be able to throw at it through the internet.
|