After sailing in last year's OBX 500, I'd go for whatever has the internal GPS. Yea, it's more expensive, but spotting a speck on the water can be very tough. John McLaughlin and I plucked one of the Accelerated Chaos guys out of the water after they capsized and lost contact with the boat. We didn't see anyone in the water until we were just a few hundred yards away and that was only because he had a whistle and was was waving wildly. These guys are very competent, experienced sailors and in an instant were facing a very grave situation. The extra money seems like folley when there are so many other places to spend while preparing for the race, but if you're floating IN the Atlantic Ocean with nothing but a drysuit and a GPS, you would spend those extra dollars in an instant if it ment getting rescued more quickly.