Spiderwire is too flat for me. I prefer a braid that maintains a little more roundness. For now I've settled on PowerPro. If you see any sales on PP post it. I may also try Sufix out for a comparison to PP.
That is exactly what I spool, 2/3 mono and 1/3 braid. Perfect for me. It is only some rockfish ya know, and 125 yards is 375 feet, Don't think I will be putting my spread out nearly that far any day of the week...