You'd want the usb adapter or the pci adapter, depending on how far away from the router you are and whether you want to run a wire or not.

and yes, george, usb >>>> pci for wireless purposes

if its any indication of quality, i have my wireless usb adapter at my in-laws house next door and its showing a "low" signal but i did a speed test and was still able to get 2.5mbps download.