Depends really on what you plan to do with the nc10, i done it because i love to tinker and total cost was about 30 pounds for card and aerial. I hate usb keys and like to move files from main pc as and when so the wireless n was agiven for myself. If you plan just to surf the web then its probably not worth it. if you are going to move large files or just love to tinker than yep its worth it.
i brought mine from
10 days from china was good service