Building a new 4K HTPC - what software do I need? (already have an nvidia shield)

Setting up a Home theatre and building a new HTPC.

I have an nvidia shield but I have the Philips Hue Sync for the lights and the HTPC runs this.

I have read the nvidia shield is the easiest way to go as I could use the HTPC just for storage and connect the nvidia shiled via USB to the PC (from my understanding, but might be wrong)

4K approx 80GB sized files

Windows 10
intel
nvidia
50TB
etc
etc

What software should I get?

MadVR, Kodi, PLEX etc?

It is a standalone HTPC and does not need to be accessed from anywhere else apart from the room itself, nor stream to any other place.

Logitech Wireless keyboard but thinking a Logitech Harmony Remote

 

Kodi is my pick if you don't need to transcode, my sheild pro plays 4k remuxes no probs

 

I have read the nvidia shield is the easiest way to go as I could use the HTPC just for storage and connect the nvidia shiled via USB to the PC (from my understanding, but might be wrong)

Do you have a link of how to do this?

I do not need to transcode at all....