I have a pair of 8800GTXs. I want to upgrade from an AMD X2 4400+ to an Intel Q6600 but seeing as I already have the GPUs, I'm torn: are the 680i/780i motherboards bad enough to make them a poor choice regardless of their SLI capability compared with non-SLI socket 775 boards and if I do go SLI, which motherboard would be best?