[SOLVED] What future upgrades would you suggest for my current setup (peripherals included)

[Compuser10165]

Hello everyone,

I built this system at the end of 2015 and gradually got to this setup:

PCPartPicker part list / Price breakdown by merchant

CPU: Intel - Core i7-6700K 4GHz Quad-Core Processor ($309.65 @ OutletPC)
CPU Cooler: be quiet! - Dark Rock Pro 3 67.8 CFM Fluid Dynamic Bearing CPU Cooler ($88.58 @ OutletPC)
Motherboard: ASRock - Z170 Extreme7+ ATX LGA1151 Motherboard ($103.98 @ Newegg)
Memory: Corsair - Vengeance LPX 16GB (2 x 8GB) DDR4-3000 Memory ($134.99 @ Amazon)
Storage: Samsung - 970 Evo 500GB M.2-2280 Solid State Drive ($147.99 @ Amazon)
Storage: Western Digital - Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($45.89 @ OutletPC)
Storage: Seagate - FireCuda 2TB 3.5" 7200RPM Hybrid Internal Hard Drive ($95.09 @ OutletPC)
Video Card: MSI - Radeon R9 390 8GB Video Card
Case: be quiet! - Silent Base 800 (Orange) ATX Mid Tower Case ($138.98 @ SuperBiiz)
Power Supply: EVGA - SuperNOVA G2 850W 80+ Gold Certified Fully-Modular ATX Power Supply ($99.89 @ OutletPC)
Optical Drive: Asus - DRW-24B1ST/BLK/B/AS DVD/CD Writer ($21.89 @ OutletPC)
Wireless Network Adapter: TP-Link - TL-WDN4800 PCI-Express x1 802.11a/b/g/n Wi-Fi Adapter ($69.89 @ OutletPC)
Case Fan: be quiet! - Pure Wings 2 140 61.2 CFM 140mm Fan ($11.49 @ SuperBiiz)
Monitor: Asus - VG245H 24.0" 1920x1080 75Hz Monitor ($181.99 @ Amazon)
Keyboard: Corsair - Vengeance K70 Wired Gaming Keyboard ($139.99 @ Amazon)
Mouse: Corsair - M65 PRO RGB FPS Wired Optical Mouse ($49.74 @ Amazon)
Total: $1640.03
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-11-03 21:14 EDT-0400

I also have the Corsair MM300 Mouse Mat.
In terms of speakers I have the Edifier R1280DB
I also have the Nitro Concepts E200 Chair

I use this as my main system for gaming, light productivity, some scientific programs, multimedia, bulk storage.

I mention that the CPU is stably OCed to 4.6Ghz.
My "future" dilema is what to upgrade next. The most logical choice would be the gpu although I am still happy with the performance (maybe when I see new GPU's in 2019?!). Also, if I upgrade the GPU I would probably want a monitor upgrade next as a 1080p 75Hz TN panel would not be enough to show the supposed increased graphical power. But my 6700K would be enough for such an upgrade?
In terms of monitor I will perhaps be interested in a good quality 4K monitor (preferably above 60Hz- maybe 75Hz if there were any at that time) with Freesync or a 1440p 144Hz one. I imagine the gaming experience would be better on the 1440p but I would also like to use the real estate and multimedia experience of a 2160p one. The reasons I would consider the 4K monitor more is that is the future standard and would not be a wise choice to invest in a stop-gap resolution monitor like 1440p.
1. So what are your opinions regarding what should I upgrade next (from my entire setup)?
P.S. I know an answer is not dire right now, but I am looking for extra opinions.
Optional:
2. What speaker system would you consider for a 105cm HDTV for a living room? I was thinking about the Edifier 2.0 R1850DB. I am not looking for a high end system, just something to improve the TV audio experience. P.S. A soundbar is not really suitable for the placement of the TV. P.S. I live in Europe, not the USA.

Thank you for any responses.

 

[Aeacus]

Only upgrade for your high-end gaming rig would be, as you said, GPU. And since you're looking towards 4K, GTX 1080 Ti is GPU to go for,
further reading: https://gpunerd.com/guides/best-gtx-1080-ti-aftermarket-card-roundup
R9 390 vs GTX 1080 Ti comparison: https://gpu.userbenchmark.com/Compare/AMD-R9-390-vs-Nvidia-GTX-1080-Ti/3481vs3918

Or you can go with RTX 2080 as well. It has same price and performance as GTX 1080 Ti but it has newer tech in it (real time ray tracing in games).

For 4K gaming monitors with G-Sync, you can look towards Acer X27,
specs: https://www.acer.com/ac/en/GB/content/predator-series/predatorx27
review: https://www.pcworld.com/article/3299018/displays/acer-predator-x27-review-nvidia-g-sync-hdr.html

Of course, being the best there is and 1st in the world that can do 144 Hz at 4K, X27 also costs a fortune.

And as far as your sound setup with your TV goes, i have 0 idea what to suggest. That's out of my ballpark.

 

[Compuser10165]

Only upgrade for your high-end gaming rig would be, as you said, GPU. And since you're looking towards 4K, GTX 1080 Ti is GPU to go for,
further reading: https://gpunerd.com/guides/best-gtx-1080-ti-aftermarket-card-roundup
R9 390 vs GTX 1080 Ti comparison: https://gpu.userbenchmark.com/Compare/AMD-R9-390-vs-Nvidia-GTX-1080-Ti/3481vs3918

Or you can go with RTX 2080 as well. It has same price and performance as GTX 1080 Ti but it has newer tech in it (real time ray tracing in games).

For 4K gaming monitors with G-Sync, you can look towards Acer X27,
specs: https://www.acer.com/ac/en/GB/content/predator-series/predatorx27
review: https://www.pcworld.com/article/3299018/displays/acer-predator-x27-review-nvidia-g-sync-hdr.html

Of course, being the best there is and 1st in the world that can do 144 Hz at 4K, X27 also costs a fortune.

And as far as your sound setup with your TV goes, i have 0 idea what to suggest. That's out of my ballpark.

Great suggestions, but I think it's wise to wait and see what AMD brings to the table. As of now, only an RTX 2080 ti is capable of 4K 60 fps gaming. And I don't intend paying that much for a GPU never mind a 144 Hz 4K monitor. I also have experienced gaming on a ASUS ROG Swift PG348Q before and very much enjoyed the experience, but considering multimedia use, I think a 4K display is more futureproof given the standard resolution. Thank you very much for your suggestions.