[davidmanze]

Hello there,

This is my first post after just joining this discussion, so please forgive me and provide kind assistance if I have posted to the wrong subsection! 

I am Looking for a Nikon camera with high resolution and advanced autofocus capabilities.

I wish for a DSLR or mirrorless model as the Budget is flexible to be honest but seeking the best value for professional-grade photography."

Hi Robberrt, 
  ...... before jumping into any sort of camera recommendation, what will be your intended categories of photography ?? 
   I ask that because you state that you need "high resolution" and "advanced" AF which already puts you towards sports/action/wildlife + landscapes.... these categories put the highest demands on equipment .... portrait and general photography not so much.
  If it's Nikon you want however, the Z8 will cover those needs and much more including comprehensive video ...... 

  so a little more information would help us steer you in the right direction ....