i wan toknow whether nvidia 6800 sLi better or ati x1900 better... which is better?? i'm planning to buy new graphic card..got any intro if got other than this ?? and now how much for nvidia 6800 and also ati x1900 in market... izzit wan use single or double graphic card... for example.. use 1 good graphic card (x1900)than using 2(SLI) nvidia 6800?pls give some comments pls.. thanks ya