VERY slow wireless, FAST wired internet problem

Someone... PLEASE help me. I just spent 2 hours w/apple, and they couldn't fix it.
I have the airport extreme base station. It was working FINE, until a few day/a week ago. Now when I connect using my airport card in my MBP or my iMac, it get about 17KB/sec. If I go wired, I get almost 2MB/sec. Apple coudn't help me. Is there anyway around this? My dell laptop (for work) connects to the extreme base station and gets about 2MB/sec, so it has to do with something on the Apple side.
Any suggestions? I'd hate to go and buy another router and having to scrap this expensive router and the airport express I bought. That's $300 right down the freakin' drain....

First, double-check the AirPort settings on the iMac. They should be nearly identical to those of the MBP.
Then, make sure that your iMac has the latest AirPort updates applied.
Other things to try...
- Create a new "clean" OS X user account, and then, logon as that user. (Note: You will want to keep this new account "clean," i.e., don't use it daily or add programs so that you can use it for any future troubleshooting session as needed.)
- Create a new AirPort Location, and then, switch to this location.
- Check Network Port Configurations and verify that AirPort is at the top of the list. If it's not, drag it to the top. While there, see if there are any other ports enabled that you are not using (Modem, Bluetooth, etc.) and disable them.
- Remove AirPort configuration (.plist) files. Start by moving the AirPort preference files to a safe location. OS X will rebuilt these files after you restart the computer. The particular files to try are (I's assuming that you have OS X 10.4+ on the iMac):
/Library/Preferences/SystemConfiguration
- preferences.plist
- NetworkInterfaces.plist
- com.apple.airport.preferences.plist
Start with the first one, restart the computer and check the wireless performance. If no improvement, move on to the next, and so on. Remember to move them to a "safe" location first, just in case you need to restore them.

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