Quattro cards are overkill and way way way overpriced. In fact, I remember seeing an article stating that GeForce cards actually outperform Quattro... the only difference between Quattro drivers are scrutinized more and stability is top notch.
I do 3D rendering and movie editing on my home pc with my GeForce 8600 GT... it does the job just fine. I found the CPU and RAM where of greater importance.
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