I have tried many, many different string sets on my GS8. Elixir, Martin, Pearse, D'Addario, DR Sunbeam, Lights, Mediums, PB, 80/20, etc, etc.
I have finally settled at D'Addario EJ16 on the top end, and EJ17 on the bottom end. When it's time to order more strings, I will order the EJ19 bluegrass set with the hope that they sound & play the same as my current setup.
I'm new to this, so take it with a grain.
This is just what I like right now.