gtx 770 sc acx vs gtx 780?

I would never spend $500 if I had a 1366x768 monitor.

I recommend the GTX770, and perhaps a better monitor as well.

The REST of your computer matters too, especially the CPU. Every single AMD CPU has a tendency to be a bottleneck in many games, and below an Intel i5-4440 (4-core CPU) you'd also start to see more of a CPU bottleneck when paired with a high-end graphics card.

I recommend the ASUS GTX770 without knowing any other details. It also comes with a code for WATCH DOGS which you should redeem ASAP as they run out. http://www.newegg.com/Product/Product.aspx?Item=N82E16814121770&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=