If you plan to use it on both the road and on trails, I would recommend a mountain bike and two sets of tires, one knobby and one set of slicks (thinner street tires made for a 26'' wheel). This wouldn't be a great choice if you plan on taking road trips with others who are riding road bikes (unless they are out of shape or you are a very strong rider). If trails are more of a notion than a reality, maybe a road bike or hybrid instead? There is so little we don't know. This is almost like asking what kind of girl should I date? Date the girl you are going to be excited to go out on dates with. Buy the bike you are going to be excited to ride, or that is best suited for the chore you intend to tackle.
$200 is a tough price point, even for used. Indicating a specific brand would be a tough call. My advice would be trying to find a bike that fits well and originally sold in a bike shop and not a department or toy store. Some folks (myself included) doubt the physical integrity of these bikes, especially for someone on the weightier side. Maybe pose this question in the Clydsdale section as well...