A 300 from the beach is the minimum I would go for if you are looking to fill the frame. 75% of the breaks around here are beachies and don't require a lot of lens unless you want to get some angles. Places like pitas, rincon, and a few places down south probably would be better for something longer but that's where a 1.4 TC and some film with latitude could come in handy.
dude, eos-1n RS! do it!