im going to buy xps 630 next month and i was wondering what would be the best graphics choice. it has 6 or seven different options but i want dual cards so i can only choose out of 2 ati radeon hd 3870 in cf or i can have 2 nvidia geforce 9800gt in sli. both cards are 512mb and pci-e. the proccesor that will be in the pc is core 2 quad at 2.4ghz and 4gb ram at 4 dimms at 800mhz. so dual hd 3870 or dual 9800gt?