"What kind of hull" you should get totally depends on what you want to do with it. If you're going to be inside the reef and calling at lots of dock you want a shallow V with minimal draft. If you'll be going outside the reef and want stability in rough seas get a much deeper V. The ONLY way for you to answer your question is to come here and see what people use for which applications.

I know used boats currently on sale in San Pedro ranging from US$3000 to US$75000, and there are probably others outside that range. What do you want the boat for?