Upgrading to the 8700k after 7 years. Advice on this build please. £2,000+

[delatroy]

Salvaging some parts from my current system to upgrade to the Z370 / 8700k that's coming soon. Want to pick up some parts in the meantime and wanted to get advice on the parts that I've selected.

Considering to buy new
CPU: Intel - Core i7-8700K Six-Core Processor ($400.00)
Thermal Compound:
Motherboard:
Memory:
Video Card:
Monitor:
Keyboard:
Other:
Total: $2446.20

Salvaging from current system
CPU Cooler:
Storage:
Storage:
Storage:
Storage:
Case:
Power Supply:
Sound Card:
Audio: Objective2 and ODAC DAC & Amplifier
Headphones:
Mouse:
Mousepad: Steelseries QCK+ Slim Mousepad

Specifically, I'd love to get thoughts on the following:

1. Best value recommendations for which 1080ti to buy?
2. What 1440p 144hz+ monitor to get?
3. What ram to get and is 3400mhz compared to 3000mhz worth it or not?
4. What keyboard is better than my current (but worn) Filco - Ninja Majestouch-2?
5. If the 7700k delid kit will work with the 8700k?
6. Is the Xonar DX sound card is worth upgrading or not?
7. Anything other parts I should consider buying?

Thanks in advance!

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[delatroy]

You can't use a Z270 board with the 8700K, needs to be Z370. Or is the 270 in your list a place holder?

Yes just a placeholder. I don't intend to buy a super high end motherboard like the Rampage Extreme, etc. In my experience, the lower end of a line are generally as stable and provide 90% of the features that you end up using.