I would pick up and i5 and stick with the 760 for now. You might have to turn some settings down but it will good enough for 1080p and a new CPU will give you a massive performance boost in a lot of games.
My used Nexus 5 is up for sale. I "upgraded" to an Amazon phone. The phones is in good condition, nothing out of the ordinary wrong with it aside from the SIM push pin slot being slightly rounded out. I will also include a black Magpul case. Charger is NOT included. This is the 16GB model.
Used sprint galaxy nexus. Great condition. Screen has very minor scratches if you look for them. You can't see them when the screen is on.
Sprint Galaxy Nexus
USB cable and charger
Excellent phone to use on Ting. Currently has a CM11 nightly...