Doing Research

I am in the middle of doing research to buy my next boat. I am currently in Missouri but will be moving to the Gulf in 5 years. I want to buy now when prices are low but want a boat that can be used here and taken to the gulf for near shore/off shore. I have noticed a near fanatical loyalty from V20 & 21 owners so there has to be something there. I have personally never seen one but am very interested. Which engine setup is best single OB, twins or IB? Is there a big difference in the strength of the hull between newer or older models? I have lots more questions but will start with these 2. Thanks