Hi,
Keep in mind that things like microwaves cause radio interference in addition to electrical interference in the power lines. This can affect the quality of wireless signal which are close in frequency to the device.
Some form of "structured wiring" in which you can drop wired network & phone (cat5e), video (RG-6), audio or some combination of those to various locations in your house is a really nice thing to have. True structured wiring is also nice because it is most always done in a "home-run" configuration, in which all the wires return to a common place in the house, where the netwoking/ telco/ cable equipment or main connections are all brought in. Makes it very simple to assign certain ports throughout the house any signal you want.
Or you could just run a single run of Cat5e for a network connection or a set of *good* quality in-wall A/V cables. If at all possible this is what I'd try to do. A wired connection will always be more reliable. I try to use wireless as a last-resort since it usually brings with it annoying problems like interference and signal quality.
-Nick :!: