I'm leaning towards Barge myself, mainly because it's bound to be better suiting for my taste. January would be a better time for me though, so if 70k is still in January, I might do it. Later on during spring isn't that good a time, and I love the idea of getting away from the cold for a couple of weeks during winter (so December, January or February would be the best).
And, if 70k gets a bigger boat, I'd rather go to Barge as a bigger boat means a bigger crowd, a bigger crowd might attract more unwanted folks (meaning more mainstream people who'd be on the boat because of one big name band and not for the whole atmosphere) onbroad.