To clarify the point I was trying to make: somebody else's pigeon-holing of a boat as a cruiser, cruiser/racer, racer/cruiser, or racer, does not necessarily say anything about the boat's suitability for blue-water sailing (high lattitude or otherwise).
Better would be to determine whether a boat was designed and built with coastal/inshore sailing or ocean/offshore sailing in mind, regardless of what style of boat it is. There are coastal cruisers and there are ocean cruisers, just as there are inshore racing boats, and offshore racing boats (and sometimes good offshore racers can make reasonable ocean cruisers).
And to reiterate a point that I think has probably already been made in this thread, boats of all descriptions have been sailed around the world (and many of them have been around Cape Horn). My belief is that, usually, it is the sailor -- moreso than the boat -- that determines the success or failure of ANY voyage.