I think the Acid 80 liters is a better choise. And the best one is the board from 2006. Its a bit faster than the older acids but still has the positive wave perfomans. From the beginning it was designed more for a "down the line board", but with the time it showed that it is exellent for onshore sailing.
I bought a brand new acid 80 (2006) last year. I live in Sweden with strong winds and chop/bump and jump waves (0,5-2 meters).And if you can find one, then it will be cheap as it is an old model.
(Special; read that from Ian Fox from the starboard team)