Get the 150
From what I have heard from the Hunter owners who have the furling main get the bigger jib. I have a dutchman rig and love the performance of my main, but one guy with a hunter 33 and furling main stated he does not even use his main all the time as it is somewhat worthless. I also took a diesel maintenance class with the Hunter dealer in Deltaville, VA and when they were asking about classes they should give, most of the hunter owners wanted a class on how to best use the furling main to get some performance out of it. So a big genoa is a big advantage. For really light air I have a small drifter (about the same size as my 135 genoa) for really light air - plus by the rules here I can use it as a dual headsail and go in the non-spinnaker class for racing.