$4000 is not a good offer $5700 is a huge deal. The basemodel version of that car is worth $7,000.
http://www.nadaguides.com/usedcars.aspx?LI=1-21-1-5013-0-0-0&l=1&w=21&p=1&f=5014&m=1195&d=588&y=2002&c=16&vi=49870&z=75028&da=-1&mi=64000
It is obvious that you only want to pay $4000 for a car. Please go to www.autotrader.com and set the limit at $4000 and see what is available in your area.