RAM: Brand doesn't matter that much. Now I see what you meant by "I do not overclock, but I would not mind the option to do so." Anything over 1600 is overclocking.
GPU: There's a reason I picked that particular 980ti: It has a dual-fan cooler that is likely to be quieter than a blower. And, look, it has free shipping now!
PSU: You only need 850W if you're going to SLI two 980ti's. As I don't see that happening, I picked out a really nice 650W unit for you.
I'll probably look at the RAM suggestion. I'm just happy with last several purchases of G.SKILL. Creature of habit?
Made a few edits, here is where I am at as of this post time. My mind... is getting foggy so I'm about to head out to garage for a bit to do some needed work on this and that.
PCPartPicker part list / Price breakdown by merchant
CPU: Intel Core i7-4790K 4.0GHz Quad-Core Processor ($349.98 @ OutletPC)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($26.98 @ OutletPC)
Motherboard: Asus Z97-A/USB 3.1 ATX LGA1150 Motherboard ($148.99 @ Amazon)
Memory: G.Skill Sniper Gaming Series 16GB (2 x 8GB) DDR3-1600 Memory ($102.99 @ Newegg)
Storage: Samsung 850 Pro Series 256GB 2.5" Solid State Drive ($142.89 @ OutletPC)
Storage: Western Digital BLACK SERIES 2TB 3.5" 7200RPM Internal Hard Drive ($122.89 @ OutletPC)
Video Card: EVGA GeForce GTX 980 Ti 6GB Superclocked ACX 2.0+ Video Card ($669.99 @ Amazon)
Case: Fractal Design Define R4 (Black Pearl) ATX Mid Tower Case ($74.99 @ NCIX US)
Power Supply: Antec TruePower Classic 750W 80+ Gold Certified ATX Power Supply ($99.99 @ SuperBiiz)
Total: $1739.69
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-06-20 18:19 EDT-0400
As a side, a few have muddied the waters on the MB pick although I think I'm 90% good where I am at with the one selected above. Their suggestions were to look at (the more expensive in some cases)
ASUS MAXIMUS VII HERO LGA 1150 Intel Z97 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard
http://www.newegg.com/Product/Produ...=ASUS_MAXIMUS_VII_HERO-_-13-132-125-_-Product
and
ASUS SABERTOOTH Z87 LGA 1150 Intel Z87 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard
http://www.newegg.com/Product/Produ...cm_sp=Homepage_FDD-_-P1_13-131-976-_-06202015