http://www.nadaguides.com/Boats/1995...0036660/Values
NADA guides has a blue book value for boats.. i did this one as an example of value for a 19ft 1995 champion boat... (have no idea if this is your boat)... .this estimated price includes boat & engine.. not sure if it means including trailer or not... I think the "value" is what the boat went for brand new with 200hp engine. the low and average retail reflect what its worth now....
hope this helps.