are you going to a buy here pay here lot. If so i'd have a local mechanic check it out first. Those cars are shit tastic.
If its a good car like no check engine light, brake light, abs lights so on and so on. I'd say 500. But then 500 is my usuall down payment number. so 200 on 4 grand doens't sound horrible. what year and mileage is it as well.