E6750 FTW. Beware its 8x multiplier (the E6600 has a 9x) depending on your motherboard’s ability to handle high FSBs (since your FSB will have to be higher for same clock speed). Other than that, it is absolutely amazing. G0 stepping guaranteed, and along with a EVGA 680i SLI (a1 revision) I have a solid 3.73ghz on the E6750 on air cooling (Thermaltake V1 heatsink *stamps seal of approval*).
As far as the original topic of this thread is concerned (video cards I believe…) I would recommend EITHER of the EVGA 8800GTS 640mb cards – depending on your preference. If you don’t want to mess with overclocking the graphics card (which is really easy to do with ATItool – try it, and yes it works with Nvidia cards), go with the superclocked version (576mhz core). If you plan to OC it anyway, you can really pick either. One on side, the 500mhz one is cheaper by $15 or so, and on the other side you are slightly more likely to get a little bit more performance out of the superclocked version, simply because EVGA will not ship it to you if it’s not stable at their factory OCed speed – and depending on your luck a stock speed card might not even make it to there.