higher frequencies = less range i get that, but doesnt n normally have more output power associated with it meaning that it will evidently go further?
Excellent question. You are opening a can of worms so big. In North America we follow FCC standards. I am not sure what governing body set the standards for Australia. I know in Europe is ETSI.
There are many things that determine a coverage of a AP but most notably is the transmitter output power, cable loss and antenna gain which makes up to Effective Isotropic Power (EIRP). A vendor can't just crank up the power if they choose to because of the standards.
This only apply in a pure N environment...
If you are in the 5Ghz, it will be shorter range not because it is 802.11n but because 5Ghz wave are half (shorter) than the 2.4 Ghz wave. But in the 5Ghz you can do channel bonding and that's where you can double your speed and get in the neighborhood of 270 Mbps.
If you are in the 2,4Ghz, it will be a longer range over 802.11g because 802.11 n allows for MIMO antennas which in fact improve the range. But in the 2.4Ghz, you are more susceptible to interference. And if you want 270 Mbps this can only happen in a 40MHz channel but the disadvantage is you only have 1 non overlapping channel.
My neighbor and I used to knock each other down with our N radios because we were both competing for the air space. To solve this problem, I switch over to 5Ghz radios.
These are just some of the pro and cons.
Hope this helps.