Well more than likely your not going to buy and benz,bmw and such for junk.there are some out there but they are very hard to find.
Any large body gm is good
Explorers,Taurus,sable,winstar
Transport mini van,Grand prixs,grand ams, lesabres,Most gms really
grand caravan,caravan,stratus,sebring,

And loads of others.
If you need help pm me on the car you are buying and i can pretty much tell what cat is on it and what it should be worth.
I will help anyone out all i can.