What is your approximate desired budget and describe a bit of your house layout -- one or two story, brick or wood frame construction, long and narrow, how many walls from the router to the other end?
Do you have many close neighbors with G or N networks (you can use the free
INSSIDER on a wireless laptop or desktop to determine this).
All of these will help give you a better recommendation on how to set up your wireless and the best device, as even with N you may need a wireless access point at one end under some circumstances.