advise on which boat to go for?

i want to start up a booze cruise on the ocean and need a boat not too big and not too small for about 10 to 20 people, I also need outside and inside space for various weather. I have no idea about which style to go for. I like the house boat pontoons style but have been told they are no good in the bad weather and can turn over easily OK for lakes but not ocean, I also want it to be as cheap as possible so any ideas and input would be appreciated