are you sharing internet if so you may want a router.
is a dlink router with dsl modem if you don't have dsl then you may not want to bother with a router as the speed just isn't fast enough for it to be worth while.
If you don't have broadband just get a hub or preferably a switch which are better.
this would work well if you don't have broadband.
Hope this helps. This is just the first uk site i stumbbled upon.