Attributes of a Coastal Cruiser
The term "Coastal Cruiser" may mean different things to different folks. I think I have one, but someone else may disagree.
My coastal cruiser (a Hunter 34) was under the $30k figure you mentioned. It has: sleeping room for four or more adults, a galley, a head (with shower), water storage for a few days (65 gallons), fuel capacity for up to 48 hours of motoring, a keel that draws less than 5'', and a rig setup that allows sailing in all directions except into the wind. The boat is responsive, quick and easily sails to its hull-speed on a reach.
A Blue-water or passagemaker may have similar attributes, but they tend to: be heavier, have deeper keels, carry more fuel and water, have smaller/tighter cabins for a given boat length, (but have at least one real sea-berth), carry less sail area and not sail as well windward. As usual, there are always exceptions.
~ Happy sails to you ~ _/) ~