can recommend notebook which have
- i5 or i7 cpu (hq variant) / u variant can consider [must 6th gen cpu)
- fhd / 4k ips display (nice colour accuracy)
- empty m.2 slot for ssd
- minimum 2 ram slot
- 14 / 15 inch
- long battery life
- design simple
- easy to exchange hdd/m2/ram
- backlit keyboard
- dual band wifi b/g/n/ac
- can pay via CC

currently in mind
- dell 7559 i5 variant
- dell 7559 i7 4k
- hp envy 13 ( but cant exhange part )

budget 1k-3.5k
if spec ok, can consider up budget

thanks

Planning to get 7559,
The only thing stop me is the display and the cup...
Still don't know to get the i5 or i7 variant...
Also the screen hear not good, not enough brightness and colour not that accurate....
4K variant is nice but also have screen problem and the price tag which make my pocket bleed.....

The problem is I don't know where to get calibrate....
planning to buy the calibrate tool but expensive....