Connection drop iMac to Apple TV - OSX Lion

Hello.
Hope someone might have a solution. Ever since i changed to OSX Lion i have had a really irritating bug with my Wifi. While browsing, downloading and doing everyday stuff my connection is fine.
However when streaming movies and tv-shows to my Apple TV (2nd) i have been getting som nasty connection drops. Its not always but to often to be anoying since i havnt had this problem before.
Scenario: I can start a movie and watch almost an hour when all of a sudden the connection drops on my iMac Late 2009 - OSX Lion 10.7.3. Everytime this happens my Wifi icon turns gray and i need to shut the Wifi off and turn it on again and all works. But once it has started the connection drops every 10 min or so and i need to reboot the machine to be able to watch the movie like "normal".
The connection between my Airport Express and the Apple TV is no problem and works flawless but my Mac cant seem to handle the "heat". I didnt have this issue on SL so im a bit bugged about it.
RSSI: -45
SPEED: 130
This is what ive tried.
1. Repair the permissions thru the OS, and the Command and R at start up, including the "resetpassword" thing.
2. Update firmware on my Aiport Express and downgraded since it just got worse.
3. Updated the airport utility, but needed to install back the old one since the new for Lion doesnt support the switch between 2.4 and 5.0 band.
4. Reset PRAM
5. Reset SMC
6. Rebuild the connection by deleteing and resetting the router.
7. Done some cleanup with OnyX.
Now im out of ideas since nothing seem to work and i hate that i have all this Apple gear for thousands of dollars and the f**** Wifi ruins everything.
Anyone?
Cheers
Chris

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