There will be some interesting decisions this summer in terms of veteran contracts and the amnesty clause. One of those players could be Oklahoma City’s Kendrick Perkins, who is scheduled to earn $17.5 million over the next two years and be the team’s fourth-highest-paid player. Perkins has been a visible leader for the Thunder, but the cost-conscious club may seek a more productive center in the free agent market for a lower price. The Celtics did not sign Perkins to a four-year, $30 million extension because they were wary about the health of his knees. While the Thunder have been pleased with Perkins’s production, they just extended Serge Ibaka, and Nick Collison, because of his front-loaded contract, is due $4.7 million over the next two seasons.