If you can get him less than 10 million, he's possibly the best defender, but he should be your best defender. I only use him when the game is not on the line. I stressed him with decision making individual training (tactical training) and he was able to get 13 decision. Which is not a bad number for a player who always dives his tackles.
If you're looking for a defender like him, you should consider Javi Martinez. He can be your BWM or your BPD. His decision stat is off the charts, but it will be very hard to get him to join you (plus his anticipation is incredible, 20, and he always scores the game winner set pieces for me... just like the UEFA Super Cup).
[h=3]Balanta is pretty good as well, he has the decision stats you would wish you can get from a defender.[/h]-jumbjumb