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For the Caribbean in winter, I love my 110. The 135 is a good compromise if you're only going to use one genoa, but the 110 and 150 seem like a great combination. If I get a 150 for the S Pacific, I'll build it a little lighter than my current 135.
I find the double headsail rig is awesome downwind and don't see any need for a gennaker or spinnaker.
I'm storing my artimon, extra Genoa, and second headsail in the aft lazarette now, but may move them to a bow locker.