Home Network

How would you go about setting up a home network, using 2 cable internet connections, with about 3-4 Pcs on the network. One of the pcs will be in the basement and the remaining ones will be upstairs on the first floor.

What hubs, cards, etc do you recomend? I am working on a budget, and I dont have much (although I am not sure exactly how much I will have.) Ideas?