Network connection extremely slow after snow leopard upgrade

I should first state that my son's new Intel Mac Mini (2009 model) is working fine without any issues - it is on the "n" band. My wife's macbook (on Leopard) and my Thinkpad are continuing to work fine - both connecting to the "g" band of my Simultaneous Dual band AEBS.
On my 2008 model mac mini, the installation went thru fine, but the network connection is extremely slow - it is connecting using the "g" band. Even when I launch the Airport utility, it takes a while to locate the AEBS and then when I click on "Manual Setup", it takes a very very long time to read the configuration. This tells me that the airport interface on the mac mini has some driver issue.
I tried all the suggestions given in other threads (listed below), but none of them worked.
1. Created a new network location and rebooted
2. Trashed the com.apple.airport.airportutility.plist and rebooted
3. Rebooted countless number of times - illogical, but that kicks in when I can't find a solution.
It is past midnight here (20miles from Apple headquarter). Going to wait for another 30minutes. After that, I will use SuperDuper to install my Leopard back on my mac mini which I had cloned before starting the installation.
Appreciate any suggestions - I am open to any prayer solution as well! If not, the Snow Leopard family pack is going back to the Apple store on Monday.
Just saw at engadget: "On a 17-inch unibody we were putting through the paces, the WiFi inexplicably has gone out and we have yet to get it working again."
Message was edited by: new2appletv

Some more info about my setup:
*Simultaneous Dual band AEBS:*
Radio Mode: 802.11n only (5 GHz) - 802.11b/g
Radio Channel Selection: Manual - 161 (5GHz), 6(2.4GHz)
*Airport Express:*
Wireless mode: Extend a wireless network
Allow wireless clients checked under the name of the network (same as for AEBS).
Both are WPA/WPA2 Personal security. And both the routers were upgraded to 7.4.2 firmware this morning with the hope that it will help.
*N Devices (both working fine):*
Apple TV 40GB
2009 Model Mac Mini upgraded to Snow Leopard - working perfectly.
*G Devices:*
Thinkpad running WinXP
Dell Laptop running WinXP
Acer Netbook running WinXP
iPod Touch
iPhone 3G
Linksys webcam
_All of the above are working fine_.
+2008 model Mac mini -+ upgrade to Snow Leopard shows extremely slow wifi connection that it is unusable. It takes 20min to load apple homepage. When I boot from the clone of my Leopard lying on my external drive, it works perfectly.
I compared the settings between all the tabs of Network-->Airport-->Advanced and they are identical between Snow Leopard and Leopard mode except that SL doesn't have the "Apple Talk" tab.
Appreciate any help to debug this.

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