I am currently trying to decide on getting the SLI or single card, and i'm not exactly sure which to do (i'm sorta new to this). I will be playing on a 1920x1080 60hz monitor. Since both options will cost me the same, this is becoming a very difficult decision.
Here is my full pc specs:
Intel Core i7-4770K 3.5GHz Quad-Core Processor
Corsair H100i 77.0 CFM Liquid CPU Cooler
Corsair Vengeance 16GB (2 x 8GB) DDR3-1600 Memory
Cooler Master HAF X ATX Full Tower Case
Corsair RM 750W 80+ Gold Certified Fully-Modular ATX Power Supply
LG UH12NS30 Blu-Ray Reader, DVD/CD Writer
MSI Z87-GD65 Gaming Intel Z87 LGA 1150 Motherboard
Both are a waste at 1080p, a single 760 would do you fine.
Between the two options though, a 780 is a better pick. Its a little slower and more expensive, but SLI solutions with two midrange cards are better kept for when you don't have the funds to go for a higher tier card, so instead invest in e.g. a 760 now and buy the next one for SLI in 6 months time. You'll have less heat, less noise, less power consumption, no SLI troubles (though few and far between anyway) and you'll have an easier time selling them on.