Spinning or conventional? You will have more frustration with 30# mono on a spinner than you'll want. If you want to use mono, Yo-Zuri Hybrid is the most durable line I have found. I uses 20# on spinners and 30# on conventional.
"Out there in the surf is where it's at, that's where the line gets drawn in the sand between those who talk fishing and those who live it."
- a wise man.