But you could get a 16 core TR chip right now going by that $3k budget there, this Seasonic unit is probably the one to go for
The M.2 you had is NVME, it's faster than a Sata M.2, but at that point it's faster than fast, so it's not a big difference, namely not worth the extra $100
PCPartPicker part list: https://pcpartpicker.com/list/sYpKYr
Price breakdown by merchant: https://pcpartpicker.com/list/sYpKYr/by_merchant/
CPU: AMD - Threadripper 1950X 3.4GHz 16-Core Processor ($959.88 @ OutletPC)
Motherboard: ASRock - X399 Taichi ATX TR4 Motherboard ($343.98 @ Newegg)
Memory: G.Skill - Trident Z 32GB (2 x 16GB) DDR4-3200 Memory ($329.99 @ Newegg)
Storage: Western Digital - Blue 500GB M.2-2280 Solid State Drive ($144.99 @ Amazon)
Video Card: EVGA - GeForce GTX 1080 Ti 11GB SC2 HYBRID GAMING Video Card ($799.99 @ Amazon)
Power Supply: SeaSonic - PRIME Platinum 1200W 80+ Platinum Certified Fully-Modular ATX Power Supply ($236.99 @ SuperBiiz)
Total: $2815.82
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-11-13 12:48 EST-0500
Plus then you end up with a big fat waterblock if you care about aesthetics for some reason
First Z370 next if your going rgb why not Aura, next wouldn't one 1080ti due better then two 1080's in most situations and also be cheaper.Not sure how your cooling that but no cooler is included. If your custom looping and do go with AURA
here what I would do personally https://pcpartpicker.com/list/h3h7zM
( edit nevermind hardrive you already have one but I am to lazy to take it out of the List.)