I've got an M140 Laptop with an internal wireless card. I've upgraded my wireless router to a Draft N router and am very impressed with the wireless speed (on the other two systems connected to the router). I'd like to get my M140 up to the new standard, but I can't find an internal card that supports 802.11n.

Are my only two choices either a USB or ExpressCard adapter? I don't really want something hanging off the side of the laptop. I was hoping there was an internal solution.