Probably the Extreme. The only other thing I can think of is if you've all of a sudden had some interference, 2.4 or 5Ghz phones, alarm systems, and microwaves are the biggies. A close by router. Have you tried going into the wireless config and changing the radio mode. If you hold down the Option key before clicking on the radio mode menu you get a bunch more choices. Choose n only all the way on the bottom if you only have n. If you click Wireless Options you can choose Interference Robustness.
Probably not that but If the population density is high, apartments etc, it's worth playing with.
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