With under 8 people, I'd say just bring along hubs and switches (your "4-port Cable/DSL routers" also function as switches, with a configuration change, I think). Make sure you've got enough patch cable (not crossover - no idea why hrdwareguy mentioned that).
You shouldn't have too big of a problem. If you've got any specific stuff you want advice about, feel free to ask. I help run a 40-person LAN party about once every two or three months, so I've got some experience.
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