Welcome to SailNet!
May we ask how much sailing experience you have?
Your english is great, but some of the things you said made me wonder if you are new to sailing. In case you are, you might want to think about a smaller sized boat to start out with, on which you can build experience. If you decide to cross oceans eventually, you will need a different boat than a typical "live-aboard" that stresses comfort and volume.
For the size of boat you want, and the budget you have, you will have to purchase a used boat. I will agree with Cruising Dad that you can probably get a very good value in the United States, due to the weak dollar and the slow economy. Florida is full of boats. Good luck to you!