Ra_V_en :
So you've put 2 totally out of the sky setups.
1st still doesn't have SSD, which was practically the only drawback we noticed. Personally would rather have AMD card since i don't care about power draw that much... then again you put 700W PSU on a PC that requites 550W tops considering all the efficiency.
2nd is just a copy paste of the first with a "moar ram, moar drive, moar gpu... we need moar power Scotty!"
Yeah pretty much. Only real underlying difference is a matter of brand selection and personal preference. I did put some actual thought into it.
The reason for the "copy paste" was as previously mentioned for a 2 RAID (as in two disk RAID0) that would allow the SSD to have something to flex it's muscles on for read/write. Plus I'm not an advocate of using an SSD on something that's going to be seeing this much of this type of usage beyond the OS. Save most of reading and writing for the less expensive HDD's. More ram (at the more ideal 2133MHz mind you) because depending on host programs and background activities while gaming and streaming might tax 8GB if say for example a large buffered pre recording is used. Plus with this case, you have a disk slot open on the lower cage for lets say a large single WD green drive for backups and what not with M.2 on the board instead. This will let you remove the upper for unimpeded airflow in the upper front fan (or rotate it for a super clean look and drastically improved airflow on upper front fan).
A second graphics card which is just an option at this point from what I understand, but doesn't hurt (and small part behind slightly larger PSU).
Current HDD's (like the FZEX) can easily support games, recording and streaming (with some sort of standard compression) on a single physical disk for non-professional situations. Realistic you would need a second mini-server or B**** computer that is basically just a bunch of HDD for various push/pull situations.
This is the third power supply to be suggested and only 50w more than the others and roughly the same price. It's not a linear supply (no for computers are that I know of) so there is no real need for head room but more usable power is more usable power. It's partially modular so at least you don't have to worry about connections coming loose on the ATX if you have to route it tightly.
The fractal case is stylish, goes with most setups, has excellent cable management, airflow and makes for a very clean install (it even has filters in it just like the other one).
Nvidia gernally outperforms most others at a consumer level in the same price range (GTX970 is great value for performance). The cards picked can be overclocked easily up to a more expensive cards specs without much of a heat issue. Plus these cards are short enough to fit in most cases without having to remove upper or lower HDD cages or other items (the upper cage and be turned 90 degrees for a clean look and not hinder air flow from top front fan as before mentioned for the suggested case).
The selected cooler has a lower fan speed (cyborg) which should help PWM noise in idle/light use situations plus the silver/chrome white would astically fit better in the suggested case. Or different type (liquid) that could allow the intake of outside air directly to the CPU cooling solution (no case heat to consider).
Asrock is a generally higher tier MB brand than gigabyte and tends to have well rounded integrated tech.
This from what I understand is mostly intended to be a gaming oriented rig so the cpu needs to be good but not $300 good.
The optical drive is honestly a random pick as most of them are about the same thing unless you looking for a particular capability or technology.
OS, somewhat unimportant as long as it's 64bit and supported by microsoft.