I built my current gaming computer back in November 2012 and at the time picked up a single EVGA GTX 670 with the intention of going to a SLI setup at some point down the line. However, it appears that this card is starting to have availability issues. Also, the price of that card has not changed very much since the GTX 700's dropped earlier this year. I am somewhat apprehensive about going the used card rout from say Ebay or Amazon, but am not 100% opposed to it. My question is this, given the price difference and possible availability issues for a new card, would it be better to try and acquire a second card like the one in my system for or to sell that card and jump strait to a SLI of two GTX 760s?