If you want the fastest possible wireless network, and you have all N-compatible clients, then on your AirPort Base Station, set the following options:
- Radio Mode: 802.11n only (5GHz)
- In the Wireless Options section, insure that Wide Channels are selected
Other vendors use wide channels in the 2.4GHz spectrum, but this is a problem as doing so can use up to 75% of this spectrum. Not great if you have a cordless phone, or neighbors that are also using 2.4GHz hardware mentioned above. As the 5GHz the channels don't overlap like they do in the 2.4GHz range, then this can be done. In 2.4GHz, if you wanted to have three non-interfering networks, they would each have to be five channels apart so that they don't overlap -- 1,6,11 for example.
You should get speeds up to 500MB per minute between two 802.11n clients with this setup.
[
robg adds: I don't know if these are ideal settings or not -- if you have advice on setting up the fastest N-only network, please add your comments.]