Upgrading 20" iMac GPU?

I was just wondering if it was possible to upgrade the 20" aluminum iMac's Graphics card? I currently have an ATI Radeon 2600 Pro and am not very pleased with it.
I have had a look at ATIccelerator but have no idea how to use it so if anyone could post me in the right direction to understand the frequencies when overclocking a graphics card I would be very grateful!
Has anyone else used ATIcellerator? What have you managed to overclock it to?
P.s. If it is possible to upgrade the graphics card, is there a shop (in the UK) that could do it for me as I am not happy taking apart my mac.
Thanks in advance!

Actually the answer is YES, the GPU can be upgraded - it is a standard MXM graphics card. Please have a look at this blog (scroll to the bottom) and you'll see the card extracted:
http://www.amfiteatar.org/content/view/155/57/lang,en/
However a whole different issue is where you can purchase an iMac compatible GPU card.

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