What speed is your internet connection ?? Doubtful that a new router would improve speed since the router you have is already much faster than your internet connection (a single channel wireless N connection supports up to approx 130 -150Mb\s which in most cases is substantially higher than your internet connection speed ! So the problem is more likely the actual speed of your internet connection not the router !
My internet in 20 or so Mbps. What I am try to say is my computers which are connected through a wired connection are receiving a connection that is about 24 Mbps according to www.Speedtest.net. But on my wireless connection I can only get about 3Mbps which is horrible for my blu-ray players with Netflix streaming HD movies. Will a dual band or high single band boost my wireless to match or be close to my wired connection? Thanks