I know a lot of folks aren't in favor of a tv above a fireplace but have don't it in two houses now and it works great!

We moved into a house with a large stone fireplace in the corner. It's not ideal but too expensive to move. It makes furniture placement difficult, and I think symmetry is pretty and the fireplace makes that impossible. If you're building, I'd definitely go with a fireplace that's not in a corner. People say that a TV above the fireplace is usually too high for ergonomics. Maybe your room is large enough that folks would be sitting far enough away to make the angles work. But if you do hang it up there, I'd go with a Frame TV that can also look like framed art. Good luck with your space--very exciting!