I've got the top virgin internet with a N router and the wireless is just not fast enough for the kids to kill people on the steam server.

I ended up buying some cheap ethernet cable's from ebay and running them under the carpet as I got sick of them crying over the wireless connection... they both have a ethernet splitter box (think that's what its called) that takes that wire and connects it to all the devices... Computer, TV, xbox and PlayStation giving them all top speed connections in each room.... it's the only way to go if you need a high speed connection for gaming mate.