1. Switches and Hubs are LAN technology.
2. for Broadband internet, you need a router
3. many routers come with built in switches.
Hubs are crap these days. Switches are where its at.
I could go into detail about hubs vs switches, but all I will say is that switches can easy and effectively support many clients at full speed. In addition, hubs cause a lot of [now] unecessary traffic which screws with your networks efficiecy.
basically, I recommend you get a router with a built in switch. USe right now for LAN gaming, and then just plug in the broadband to the WAN link when you get it.
cheers!