Well, the 770 is obviously a faster card, and will give you better performance than the 760; 1680x1050 isn't as hard to drive as 1080p, though, and might not live up the card's full potential in easier-to-run games. Do you have a budget for this card? The 770 would be a much better match for your FX-8350 than the 760, but only if you have the money for it.
Also, a monitor would be an easier upgrade later on than a video card; if you went with the more powerful card today, you'd be better prepared for when the day comes that you decide to pick up a better monitor with a higher resolution.