Also, you won't need a custom CPU cooler as you're not going to be overclocking, so you should be fine when it comes to temperatures.
However, Mongius' build is fairly good and I'd consider that as well. (really just depends on what you want, but I gave you an option to have DDR4 memory)
Actually the best build I've seen in this thread yet, and I fully appreciate the efford you made here, but let me explain why mine is better despite using DDR3 (but I really like that you were able to cram into a mouse + optical drive + windows, gotta admit that I wouldn't been able to do that, but I chose a way so that OD and OS are not even mandatory to buy).
Main difference here are the Mobo, CPU, Cooler, Mobo and - what many falsely undervalue here - the SSD.
CPU : I don't know how many of you actually know it, but I have the feeling that it is uncommon to you guys here that the Xeon E3-1231 V3 is in every point fully equal
to the i7-4770.
If you fire up intel ARK, and compare the site of the Xeon
and the site of the i7
they are absolutely equal, with the difference that the Xeon costs up to over 60$ less (for the namescheme, a Xeon E3 is always the same as an i7 but without overclocking). So you get an i7, and thus effectively 8 Cores (I won't go into depth how hyperthreading works but to make it very simple you can say it has 8 cores), which doubles out the i5 6600 on corecount.
but corecount is not everything so lets get to benchmarks.
Before you take a look at the graphs, I want you to know that the guy who provided me with these benchmarks did use an i5-6500, which compared to the 6600 has no difference but 100Mhz more (resulting maybe in a gain of 1-2 fps) so don't be irritated by this. He also overclocked the i5 via the baseclock (which is not possible anymore cause intel forced Mobo manufacturers to disable this) to show that the Xeon is stronger, despite having up to 1,1Ghz less clock.
As you can see the Xeon beats the i5 clearly and is much more future proof as the corecount games utilize increases more and more nowadays.
for RAM, the difference between DDR3 and DDR4 are nanoseconds in terms of speed and performance, the actual step up here is the lower voltage DDR4 uses, but that is more targeted onto servers than usual consumer gaming PC's so scrap that, there is no
As for Mobo, I was semi-forced to use the more expensive H97 board because it utilizes a m.2 slot (which just got popular with the introduction of Skylake, thus it was a little harder to find on H97), thus we come to the SSD.
For SSD's there are two main things you want to consider : 4K Read and sequential Read/Write. Sequential R/W is limited to roughly 550/500Mb/s on Sata SSD's, so if you want to go higher than this you need m.2. This is just how fast copy copies big chunks of data, for example when you move a game folder from one drive to the other.
4K read on the other hand is what makes the feelable difference, as this determines all the little things like opening a program or any other thing you want to actively use, so this is the sector you want to put your main focus on.
As you can see, the Samsung is 22Mb/s faster on 4K than the A-Data, resulting in up to 2/3 more feelable speed. Also I chose the 240Gb version because it gives you double the capacity for 20$ more compated to the 120Gb model.
CPU cooler is a quality of life improvement, as it is quieter, stronger and will make your CPU live longer. Nothing is more annoying than a boxed cooler at 100% speed. That feels like an airplane engine starting next to you, as the Hyper T2 first gets hearable at around 70-80% fanspeed. Also because the T2 is stronger, the fan will spin slower and still be cooler than the boxed cooler at same RPM rates.
Cutting out on the mouse, OD and OS, this by ~140$ increased budget will grant you about 1 year more of reliable use before a new upgrade is needed.
Also a little tip from me : Do not buy a physical OS at vendors. Get just a non-OEM key from Ebay. They go for 20$ (a quarter of the price you get on Pcpartpicker). You can enter this key on Microsoft's homepage and they will provide you with a downloadable ISO which you can burn onto a DVD. Also you don't need to worry if the CD gets scratchy and unreadable, just download and burn the ISO once again