1 router
1 8 port switch
lan cables. ..
conect all pc's to switch via straight cables
assign each static ip's
connect switch to router ... connect "WAN/internet" port of router to broadband cable from ISP
cost shouldnt be much at all ....
but i dunno prices so i wont say
if u need details go ahead and ask ... me or our resident network freak, digen will be here to help
ofcourse there's deep too