USB network

Im looking to network 3 PC's

here is the plan

1 box allways on (its going to be a MP3 player for the Office, allways on, connected to the net all the time, might even be a Online Radio, but thats another idea ;))

i then have my main PC, its used for surfing the web and the odd download

then come my games PC, used for just game and the odd online game

so i want to connect them to my "allways on box" i dont mind if only 1 of the machines (games or net PC) can axx the net at any1 time

my Teck knowledge isnt the best, ive trieds to network 2 PC's before with crossover cable, i spent 3 weeks trying, turned out to be a Duff Nic

so i wouldnt mind straight PLUG AND PLAY type of thing

Cant you just get a switch and some network cables? Would be the easiest. Just set the always on pc IP as the gateway IP.

given that most PCs have onboard NIC's , and you can pick up a 5 port switch for peanuts, conventional networking will be a lot easier than anything USB like ;)