Best Setup for wireless Speed

Hi,
Just womering what the views were to getting the best speed from a new infinity circuit. Wired in I get 75/15 but on wireless this drops to 30/15.
Is it best bet to replace the Home hub. I have tried N adapters and changing the wireless interface type to 40 MHz but no real increase ?
Has anyone seen/managed to get any better results
Also I have this below but I can't disable. Is this right ?
Thanks,
BT FON:
Active

My best speed over wireless used to be 30-35mbps, upload around 16mbps, after changing the hh3 wireless settings to 40mhz & enabling the 40mhz function on the wireless n adaptor on my laptop (which was disabled by default!!) I have just had a speedtest result of 70 mbps down!!
I also had a massive ping decrease which was previously jumping around all over the place and usually 100+ms, after making the changes above and running the ping command I'm getting a much more stable ping of around 20ms.
http://www.speedtest.net/result/1971328969.png
I know have a wireless connection which is 98% as good as my wired connection, which gets me 75 down.

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