RE: evo 74 or 83
You're boarderline 74/83, and its hard to say which one is the best with the sparse info you're given us. What I can say is that at you're weight and for B&J useage the 83 will handle 4.2 pretty well and it has a faster rocker which is nicer for lake sailing than the 74. However, if you plan to ride wave, the 74 will be a better all round board for your sails. With a bit more fin, the 74 is still OK for the lake sailing and it will give you better control and a generally easier time in the north see waves.