I own a Palit 8800GT 512MB DDR3 pci 2.0 etc. It was cheap and in stock. It's a nVidia reference card (stock) and not the sonic version. I've heard of problems with the sonic model but thankfully mine works perfectly well. You'll probably lose a few points at the benchmark but that's the price you pay. I've never tried to OC it, though.
e6750/Asus P5k SE/Palit 8800GT 512mb/2x1 GB corsair xms2-6400 800mhz/x-fi xtremegamer/logitech x-540