I know what you mean Willie. Fished Loe Bar where it doesn't pay to be too close to the waters edge, seeing as it's shingle etc.
I remember when younger that fishermen were lost off a ledge @ 150 ft high. (Was it something like Tubbs Rock?)
If it's at all dodgy I'm thinking of wearing my life jacket?
Ross I'd stick to 15lb as you'd have a shock leader. 20lb does make it a little harder to cast.
If it's rocky but deep, only requiring a lob, I think a lot of people go for 30lb all through.
As for leaders I just use 60lb so I don't have to change when moving from 5 - 6oz leads.