thats a tough call, I would take the 1 which is in the best shape, make sure you take a knowledgable friend with you to look at all 3 then take the best 1 to a mechanic so he or she can check it out, good luck
Tempo, Buick, Cavalier, in that order, if the mileage and price are correct. Of course, condition of the car and your personal preference count for a lot, along with verifiable maintenance records. Good luck with it.