Bristol 45.5 - AiniA
Join Date: May 2006
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What you are doing would generally not be considered offshore although there would be several overnights - the difference is that you generally get to choose a weather window in each case eg to Bahamas and from southern Bahamas to Turks and Caicos. You can still get crappy weather within a decent forecast.
Any of the boats you mention, if well-equipped, could be used. You should be aware that the three boats have some fundamental differences. The most obvious example is the Nonsuch which has a different rig from the other two. Also, the Nonsuch is enormous compared to most 30 footers. In fact, I suspect that a Nonsuch 26 might have more interior volume than a Cape Dory 30. The ODay and CD are the same length but have completely different hull forms. Also the boats you ask about are hugely different in price with ODay 30s of different ages from $15k to $30k and Nonsuches from $35K to $80k (CDs somewhere in the middle)
I think you need a lot more information about boat designs in general so that you will end up comparing boats that are more alike. Also, figure out what your budget is, keeping in mind that you will have to do significant upgrades on almost every boat of this age and that the more you spend on the boat the less you have for your cruising kitty. Choosing a good boat really matters (there is not one 'best' choice) and it is worth the research.
Back home on Lake Ontario after something over 36,000 nm circumnavigator. Not surprisingly there is a lot of stuff I want to get done on Ainia both cosmetically and functionally. Getting an early start so it will be ready to go for next summer (Lake Superior?).