Linksys Wireless Router :: WRT160N Not Providing Fast Wireless Speeds?

I recently bought a WRT160N Wireless router and am not getting fast wireless speeds. My ISP told me my speeds are 10mbps download and 1 mbps upload. I realize that this is not lighting fast but it is all that I feel like i need. My speeds on the WRT160N are about 2-3 MBPS d/l and 600kbps u/l on my wireless connection, which is hooked up to my playstation 3. My wired connection, which goes to my pc, is 9.75 mbps d/l and about .95 mbps u/l, which seems right. Why am I getting such low speeds with a router that is suppose to be build for faster wireless and longer ranges.To make a comparison, I have been using an OLD linksys b-rated router. i can't exactly remember the model, but i think it is the bef11s4, it came with a network card and is about 6-7 years old. I was getting 3-3.5 mbps d/l and 800kbps u/l with the b rated router, and it seemed like a better reception, like in the 80's-90's. ThisWRT160N is getting like in the 70's and sometimes lower.I have tried setting the router to open all ports to a dedicated ip address, it made things a little better, maybe getting 2.5 mbps d/l at the most. What am i doing wrong? I have heard something about tomato firmware but am not real familiar with it?