This is what I do when I get a new "used" car, flush the fluids (brake, coolant, oil, tranny, power steering), change plugs/air filter. I do it myself so it all costs me under 100$, sometimes I don't need to change some of the fluids because previous owners have done it before (only believe previous owners if they provide paper work to back it up). Otherwise make sure a GOOD mechanic has a once over of the car and inspect for wear, if you haven't done so already.