NZXT Aidan :
babernet_1 :
Normally you start with the best single card you can afford, then a few years later go SLI and be set for years to come. Getting two 760's now will mean you will have to update from scratch in a few years.
another thing I am running three 1920 by 1080 monitors
Three monitors. Yes, you will need more RAM. 3GB min, 4GB is better. I'd consider the R9 290 with its 4GB of RAM. I've heard of people unlocking these to make them R9 290X's.
Either way, with triple monitors, you will need some serious graphics power.