Consider powerline bridging. It uses your home wiring in place of ethernet cabling or wireless to bridge the PC to the router. Doesn't work in every case, but when it does, it's generally much better than wireless in terms of reliability, speed, consistency, etc. I've see a pair of powerline adapters recently (500Mbps, iirc) for as little as $40 USD. And you need at least two; one has to be connected to the router over ethernet, the other your PC. You can extend the powerline network by simply adding more adapters.
Thank you -:D