This post is a mental note on how I upgraded my laptop's wireless card from an Atheros card to a fancy Intel 7260 AC WiFi adapter. For all of $30 too!
Intel 7260 @ Canada Computers:
Really helpful tear down instructions:
Intel 7260 drivers (Windows 8 was able to find these automatically):
These drivers are the latest as of this writing.
Notes and maybe instructions on upgrading the WiFi card in an Asus K55A should be up soon too!