EDIT: Just replaced my GTX 660 and installed the GTX 770, Wow! It is awesome. Tomb Raider Benchmark in Ultra Settings gets an average of 96 fps! (that is without v-sync). Runs Crysis 3 on Very High and SMAA 1x at 90-120 fps. I actually have Geforce Experience customize the graphics for Crysis 3 (which makes some graphic options lower than very high), run it on SMAA 1x and it maintains a very steady 120 fps. It runs modded out Skyrim in max settings at a very steady 60 fps. I also recently overclocked my CPU to 4.0 Ghz.
Original Post with the GTX 660: This is my very first build. I use it for gaming. It has worked really well so far. All I've played on it is Tomb Raider and Crysis 3. Runs Tomb Raider in Ultra settings at 50-60 fps and runs Crysis in Very High settings at 50-70 fps. CPU hasn't gone above 49 C with the hyper evo, which I just added. I had the stock cooler in there for about a week. It was loud. Crysis would bring it up to 59 C in about 10 minutes. Today I played Crysis for about 45 minutes and the CPU didn't get past 49 C.