I just bought an 03 Civic LX Coupe with 43K on it for 14,000 (CAD). Mine is a Manual Transmission. I love it...nice upgrade from a 97 Corolla. Just wish it had the same horsepower as the EX (since they are both 1.7).
To get a black book value, I usually go to
www.toyota.ca and price a vehicle. You should see an option to get the black book value of a vehicle for trade in. You should be able to find a similar site if you are not in Canada.