Building a new one

So in need of some opinion since for the longest I am going to build a new desktop since I'm going to take my heavy alienware for other use. Here are some parts I decided to pick. I'm not sure should I change some of it + or - other misc like liquid cooling.

2x EVGA 04G-2983-KR GeForce GTX 980 Superclocked 4GB 256-Bit GDDR5 ACX 2.0 PCI Express 3.0 (combining)
Arctic Silver 5 High-Density Polysynthetic Silver Thermal Compound AS5-3.5G - OEM

G.SKILL Ripjaws 4 series 16GB (4 x 4GB) 288-Pin DDR4 SDRAM DDR4 2800 (PC4-22400) Desktop Memory Model F4-2800C16Q-16GRK

Intel Core i7-5930K Haswell-E 6-Core 3.5GHz LGA 2011-v3 140W Desktop Processor BX80648I75930K

2x SAMSUNG 840 EVO MZ-7TE500BW 2.5" 500GB SATA III TLC Internal Solid State Drive (SSD) (raiding it)

and that's what I have so far gonna try to keep it around 3k.

update

Antec Nine Hundred Black Steel ATX Mid Tower Computer Case with Upgraded USB 3.0

ViewSonic VG2039m-LED Black 20" 5ms Widescreen LED Backlight Height, Swivel, Tilt LCD Monitor

Rosewill HIVE Series HIVE-1000 1000W Continuous @40°C,80 PLUS BRONZE Certified, Modular Design, Single +12V Rail,ATX12V v2.31/EPS12V ...

Logitech K120 Black USB Wired Standard Keyboard

GIGABYTE GA-X99-UD4 LGA 2011-v3 Intel X99 SATA 6Gb/s USB 3.0 ATX Intel Motherboard

DEEPCOOL Gamer Storm Lucifer V2 CPU Cooler 6 Heatpipes 140mm Silent PWM Fan Support LGA 2011-v3

OKGEAR 18" SATA 6 Gbps Cable, Straight to Left Angle W/ Metal Latch, Black, Backward Compatible 3 Gbps and 1.5 Gbps

Rosewill RCDC-14003 10 ft. White DisplayPort to DisplayPort 28AWG High Bit-rate 2 DisplayPort Cable M-M

Can't help but wonder what you plan to do with your pc? This pc is overkill in every posible way. Btw dual channel for ram is better than quad channel. For 16gb, go with 2x8gb.

Yea this is overkill, but I was wondering if I kept it as quad it will help with prevent some bottlenecking and lower some of the latency.

might change monitor, motherboard and power supply.

Generally, it's up to 2k USD in actual hardware parts (like anything in the case) before you're getting hit with diminished returns. Still, if you're planning a couple of years of heavy usage, that 'limit' might be higher.