I'm currently building a computer that I will be editing HD video and special effects on, and in addition to that I wish to game at max visual settings for as long as I can. The plan was to get a GeForce 770 for the time being then get another one to SLI them later down the line when it was needed. Would it be better/smarter for me to just get the 780, or maybe just one 770 is enough. I plan on gaming on one monitor.