Unlike the last build this will be able to play all games on good settings with a good fps. With the aftermarket CPU cooler it will make the build less noisy and keep the CPU nice and cool. Same rule applies won't require that much power and with the SSD it will allow very quick loading times in games.
This build using a 4960K as well with a H80I will allow for great overclocking potential and keeping the CPU very cool. With the Superclocked EVGA Geforce GTX 770 it will allow you to play any games that you want to on high settings with great fps.
Yeah I actually thought the same thing about the mid range build, but I decided against it because I thought people might complain I put a core i3 on the list. (Which a lot of people say it sucks for gaming.)
About the High end build, the reason why I went with the higher quality PSU is beacuse it was modular and having a modular PSU in the 450D would look much better than a non modular one. It helps as well to have a gold certified PSU.