A sensible question, and I agree with Irwin, tough to define. Head to the best wine store in your area and buy two different makers' 2004 red Bordeaux. $20 bottles will be fine. In one, most likely both, you'll taste robust tannin in effect. Always best to have your own definition.
While it's not Cab, but a Sangiovese clone, If you have a bit of cash, most 2001 Brunello di Montalcinos (from Italy's Tuscan region) should do. Try a Frescobaldi Castelgiocondo.