This was my first build that I entered the PC gaming world with. I used the EVGA 780 Ti Superclocked w/ ACX cooler and not the Kingpin that is listed. It is a shame they don't have my model still in production so that I could have doubled up twins.
I am very happy with my build, but there are some things I would do differently at this point in time. First on the list would be to grab a i7 4790k, as the 4770k series run hot. Secondly, spending a bit more on ram at higher speeds would have been some added fluff. The third change is that which I intended to do in the first place. That being a larger AIO water cooler. A Corsair H100i or even Kraken x61 would be nice to have in my system about now. I just bought what was available at the local store. Now the 4th and final adjustment I would make and plan to make in the future involves the case. The Corsair 650D is a quirky one! With the limitations of a 120mm exhaust, 200mm x 200mm x 20mm front intake (insanely hard to find a nice replacement without modding), and a super easy to scratch side window. It just doesn't make sense to buy this case at that price point. The build quality other than the side window is great though.
Like I said, in the end I am happy with my system and on the bright side it will be fun to make the necessary changes in the near future.