"We Need a boat that will not capsize and that is able to sail on the atlantic without a problem and will not get damaged in a storm or sink."
As far as I know, such a boat has yet to be invented (remember the Titanic).
Also, if you plan to do this for less than $8,000, then you need to expect repairs - you are not going to get a perfect boat for that price. If it were me (and it is not), I would put that money into a smaller boat to sail locally until you get enough experience to go offshore in a capable boat. If you seach the threads here, you will see plenty of threads addressing plans similar to yours.