Thx for the reply.
I'd prolly go with #2 as I don't want to spend too much because we're planning to move to a bigger house as our family grows. And also, the house was built with very stabdard stuff and nothing fancy at all. ( The other options seem to cost a lot more $$ )
I also consider #4
But what do you mean "running from bottom of mantle to floor the same width as between fireplace wall and outside wall " ?
The way I understand it is : If I do the I do the pillar face, they should not be longer than the space between the fireplace and the wall on the left of the picture?