I am thinking about getting a 680i board or waiting for the cheaper 600 series boards- I will likely get whatever mid range or low end dx10 board is available in mid january- My question is if I dont have the cash to ever buy 2 high end cards for SLI and upgrade my graphics only every 16 months or so- Will I ever really go with two old cards in SLI or would it always be faster to just get whatever the latest mid range card is and sell my old model? basically will 2 16 month old cards in SLI ever really beat a new gen single card?