Gonesailing....with all due respect...if at this stage you don't know the answer to your questions, you need a little more effort, and knowledge before you go on something like this.
I am not saying you should not or you will not be prepared to do it in a few years...it just seems to me you're lacking basic knowledge to successfully achieve such goal. Sure you don't want to be anther statistcs number.
Please read more, learn more and then enquire about the boat...You will realize, that the more you know, the more the right boat seems to present it self in fron of you...
At this stage your question sounds like this:
I want to fly around the world in a plane, should it be red or white?
Please, as I said, no disrespect.