There is no such thing as a bluewater boat.
Where do you want to go? What is your budget? Let's start there.
THere are a million threads written on this on sailnet and other places. Youu will get twice that many opinions. If you will give me an idea of your itinerary then I can give you my opinion on a suitable boat.
Just remember the old adage: Better to go around the world on a Hunter with an experienced crew than a Valiant with someone that doesn't know what they are doing.
Amen, well said, and very true !!!