considering the prices you seem to be willing to spend, go with the 780 ti. or perhaps sli msi 780 gaming (only $500 right now). Not sure if you hve been swayed yet, but the 690 only has 2gb available per gpu core and so is kinda obsolete for higher memory usage games. tri-sli you WILL see diminishing returns for that third card sadly. Your best bet , in only my own personal opinion, for the kind of money you are looking at spending, upgrading to a 2700k (literally one of the best processors around if you can find one, it will overclock past a 4770k under water and you won't notice a difference between that, and the 4770k.) sli 780 are great, and with the i7-2700k, you wouldnt need to buy a new motherboard either.