if installing network cable in new build (estimate year end) , is Cat-6 still the way to go ? Worth to go for Cat-6A / Cat 7 ?

mainly to connect NAS to Home Office and room media player.

also for IP CCTV (Hikvision or Ubiquiti ?)

thanks, I've been reading up these few days. Still seem Cat6 (not even Cat6a) is OK ?

1gbps should be good enough for NAS to "Home Theater" (cheapo projector) ?
I have 1 existing installation of UBNT and 1 with HIK (separate location, each about 20 cams). Both 5 years old, UBNT didn't need to replace anything yet although 1 cam IR dosen't work.

HIK had to change 2 cameras. Yea cost wise I can buy a whole new set of HIK comparing with UBNT ... but just wondering if there are more "premium" model for HIK that lasts longer ? since this is for my own house, prefer something with least hassle / highest reliability.

you mean for UBNT ? I use both, dome for indoor and G3 for outdoor.

Problem with HIK is tough to know if it's a more premium/highend model or seller just marking up the price