Hello I've currently made my first PC strictly for gaming and have recently purchased 3x 27" Acer monitors for bf4 and titanfall my question is " wat is is best GPU I can buy for under 700 bucks and eventually sli a couple months down the road?" This single card I'm looking at is either a 780 or 770 4 GB wats my best choice? My motherboard can hold 3 GPUs so maybe 3 cards in fall? Ty