Dlink or Linksys four port wireless router will work. If you don't hard wire the puters you will need Wireless NIC or usb Based wireless for each computer(laptops with on-baord wireless excluded as they are ready to go). I hope you are not buying all that stuff...It's gonna get pricey. Once all computers are networked and linked, all will have internet access.
Noli Nothis Permittere Te Terere!!
EVGA 680i, Dual EVGA 8800GT'S (650/950), 4 gigs OCZ DDR2 1066, Intel Q9450 at 3.8 Ghz, Koolance Water Cooled, Dual Plextor16x DL DVD+/-RW. Dual WD 250gb 16mb Cache Sata 3.0. 3DMark06 score = 19,168.