We'd be better with something under $5000 for now.
We have a 93 Corolla Wagon but it's getting pretty beat up from this work we do.
It gets 25-30 MPG but a little less with this work because I keep the engine idling for my partner to stay cool in the summer, so maybe 22-23 MPG this way.
But we don't really need the wagon part that much and if we could get 10 MPG more with something else, maybe a 93-95 model might work.