The Raiders' two Pro Bowl defensive players, CB Nnamdi Asomugha and DL Richard Seymour, are headed for unrestricted free agency this offseason and will be expensive to re-sign. Managing general partner Al Davis also might have to pay a premium to bring back one of his top weapons on offense. TE Zach Miller, who was named to his first Pro Bowl this week to replace injured Chargers TE Antonio Gates, could get a chance to hit the open market if the new Collective Bargaining Agreement allows players with four accrued seasons, like Miller, to become unrestricted free agents. Davis is very high on his young corps on offense, and doesn't want to see one of its most valuable members depart. Sources expect Davis will be willing to overpay to re-sign Miller if that's what it takes. Miller, 25, scored a career-high five touchdowns last season and he has led the Raiders in receptions in each of the past three seasons.