Both ATi and nVidia has been shipping out chips like there is no tomorrow. And since many 3rd party manufacturers wants to make their cards unique they add/remove things making it even harder for the consumer to get a grip of reality. Below you will find reviews from other hardware sites that will hopefully make your choice a little easier:
First we have bit-tech that has tested a roundup consisting out of PCIe graphic cards (and their respective AGP-version):
– Sapphire RADEON X800 XT (without PE)
– NVIDIA GeForce 6800 GT (PCIe model)
– NVIDIA GeForce 6600 GT
– Sapphire RADEON X600 XT
– Sapphire RADEON X600 Pro
– Leadtek WinFast PX350 TDH
Read more here
And for those of you who wants a different cooling solution can check out Hardware12v’s review of Gigabyte 3D Cooler-Ultra. (Babelfish link).
I hope this set of reviews helped you at least a little.