pedramtolo :
thank you so much
i will buy this build of yours for factory but with some changes
i will buy two ssd 120gb and use them in raid 0
and two hdd and use them in raid 1 for backup
Do not use RAID0 in a build you've spent extra money to optimize for reliability (ECC etc).
Better solutions are:
a) M.2 Ultra, and
b) PCIe
EXAMPLE:
http://pcpartpicker.com/product/Tr7CmG/samsung-internal-hard-drive-mzhpv256hdgl00000
review
http://www.tweaktown.com/reviews/7181/samsung-sm951-nvme-2-pcie-256gb-ssd-review/index.html
"up to 1260MB sequential reads" (256GB version)
You need to investigate carefully to see where your bottlenecks are for reads and writes or you waste your money, or have lower performance than you should. If you already ordered, I suggest using those SSD's for RAID1 to increase reliability, and also setup an automated backup solution with Acronis True Image.
RAID1 for important files is good (and you should add the Acronis backup for added redundancy), but you may also want to investigate additional backup solutions external to the workstation (you may already have a LAN NAS for other workstations to share).
I also use SyncbackSE Free to mirror individual folders on a daily basis.
I suggest an APC voltage regulator like THIS:
https://www.amazon.com/APC-LE1200-Automatic-Voltage-Regulator/dp/B00009RA60
or a UPS (battery backup) that outputs "pure sinewave" (required for active PFC in power supply), however a UPS is fairly expensive. Cyberpower has models with "PFC" in the name which work, and a 1000VA (600W) unit is probably about $150USD or so.
With a monitor this only gives maybe five minutes or so of usage, though its main purpose is to prevent a PC crashing due to loss of power. It's probably not your decision whether this justifies the cost or not.