If you're still having an issue. I suggest you buy a D-Link router. I had it for 3 years and I had my system all over the place. 80-90% signal strength and no lag at all. Ever since a thunder storm strike and it blew up my router. Had to get a new one and I am using a Linksys and never go wireless. I barely get signal around the block. However, I have all kind of Ethernet cords (cheap, expensive) and they are running perfectly fine.
http://frys.com I don't know if they have deliveries in your area.