Well I have a 10 mbps card and the limiting factor while downloading is either the source or the broadband connection itself so you won't have trouble [img]smile.gif[/img]
You only need the first 2 cause the cable goes to the router and then wired to one computer and wireless to the other(s). For security check out the WEP settings and DON'T broadcast your (e)ssid. And even if your router has a builtin firewall I'd use a software firewall for extra security as well (nice for inside the network as well)
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