I take it you have a PC downstairs as well? Anyway - I would go for the second link because that has 4 port ethernet connections for cable as well as wireless. Attaching the USB adapter to the downstairs PC you can set up the network wirelessly or by cable. to the router/modem. Upstairs the Centrino should be able to pick up the signal quite well but it depends on how many walls or floors it has to go through. I set up a wireless router on the middle of three floors in a Victorian building successfully. If it doesn`t pick up the wireless the fall back is always the cable but I suspect you will be OK.