Originally Posted by idi banashapan

whilst you're doing a big job like this, and you're able to, do the best job you can. 10Gb will provide enough speed for the next 10, maybe 20 years, even (for example) for streaming uncompressed 4k content off the NAS to multiple devices in the home whilst other services and data runs across simutaneously. Maybe other large files are being used, such as CAD or video encoding straight to the NAS.

Regardless of the reasons, putting in the fastest you can now is always the best idea, imo. If you only go for what you need now, it will only be a short while (certainly shorter than if you did the best your could) before you are sitting there wishing you did it better the first time round, as you rip out what you've done to replace it with something faster!