To couch or not to couch...

The big debate in our house right now that involves furniture stores is do we get a couch or a sleeper sofa or one of the newer futon type couches that doesn't make our living room look like it's a fraternity house. With the impending visit of my husband's brother from Puerto Rico we really do need something he can sleep on so the couch will probably end up not being a couch unless it's a sleeper couch...