leave it on auto - i do think though it should have a setting to allow you to select n only and not bother with b/g
I've replaced my HH3b Wifi With Edimax 802.11n kit as the HHs Wifi keeps cutting out and brodcasts at a much lower power than my Edimax AP.
BTW, Now I have WiFi diabled does FON still get picked up by the hub or is that disabled too. I Know FON is disabled in power saving mode.
To Iknowyourusername. It is best to avoid the n 40 option unless you really know what you are doing. It uses twice the wireless band width, and therefore interferes much more with your neighbours' wireless stuff, and suffers more from interference from them. If the wireless adapter on your computer can cope with the speed you might appear to get a higher connection rate, but the interference may well cause such high packet loss that the actual data throughput will drop.
To Annie. If wireless is off on your HH3, then FON is off as well.