It sounds like what you may need are more wireless access points similar to an item like this from TigerDirect.
»www.tigerdirect.com/applications ··· atId=372
It has one Ethernet port on the back, and allows you to extend your Wireless coverage for a given area. In this case, you only need to run a wire to a few locations and put a bunch of these up in your home to get the coverage that you need.
I would make sure that it supports Wireless n, and is fully configurable to meet your needs.
While that exact make/model may not be what you need, I do believe that the type of product (Wireless Access Point) is what you are looking for.
Hope that helps,
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