Hey seems like we are looking for similar setup.

First one is RGB, 2nd one is connectivity. Its up to you.

No problem with the new setup (I assume you can top up your budget since the total cost of your initial build is around 3k only).

Need to know the full specs, CPU + mobo + GPU cannot determine the price.

Depends on the games you play, overclock the CPU if CPU is bottlenecking the card.
Too high for me, if it is around 4.7k I'll consider it.

It is not really meant to take over the role of traditional monitor (and its connection), it uses WiFi Direct and traffic doesn't route through your router so latency is significantly lower, but then it is still prone to interference, signal disruption etc, cable is still the way to go.
I7 6700k - New i7 7700K is around 1.5k
Cyorig h7 - New unit is around 200
Asus z170 pro gaming - Leftover stock is around 750 (replaced by Z270)
G.skill ripjaws V ddr4 2400mhz 8GBX2 - New unit is around 600
Gigabyte gtx 1070 g1 gaming - New unit is around 2k
Xigmates shogun 600w 80+ bronze - New unit is around 350 but sadly this PSU is an overpriced crap
Samsung 750 120gb ssd - New unit is around 250
WD Blue 1TB - New unit is around 220
Corsair Spec Alpha - New unit is around 350
Windows 10 - OEM? Retail? OEM is cheap, you can buy from lelong, GS, 11street, lazada for just 50 (example)

Total: around RM 6300

Now lets talk about second hand market price.

I7 6700k - around 1.1k -1.2k
Cyorig h7 - around 100 - 130
Asus z170 pro gaming - around 500 - 550
G.skill ripjaws V ddr4 2400mhz 8GBX2 - around 450
Gigabyte gtx 1070 g1 gaming - around 1.6k
Xigmates shogun 600w 80+ bronze - similar grade PSU is around 150 - 200
Samsung 750 120gb ssd - around 150 - 200
WD Blue 1TB - around 150
Corsair Spec Alpha - around 250
Windows 10 - around 50

Total: around RM 4750