Ok im looking into all of my options here. I have a 256 mb crossfire ready gpu picked out with128 bit interface. Then while browsing new egg i found an Nvidia geforce 6800gt with 512mb of memory and a 256 bit interface, thats sli ready, for about 40 dollars more. The nvidia card howver has 8 pixel pipelines and 350 mhz core clock speed. the ATI card has 12 pixel pipelines and 600 mhz core clock speed. Is it really worth it to upgrade to the nvidia, or stick with the cheaper ati card. Somone said they OC to 400 mhz core clock speed. So which is really worth it, i have a motherboard ready for each sollution. And im not planning on going with 2 GPU's right now, but i want it there as an upgradeability option.
oh and heres links to both cards
Nvidia geforce 6800 gt
Ati power color x1600xt