The Diamondbacks' farm system suddenly must be considered one of the game's best; organizational products helped the team overcome its rash of injuries, rally from a 10-game deficit on June 14 and become a serious contender. The major-league roster is aging, but the team has multiple options for the future. Consider the depth at second base. Junior Spivey could end up in center field once Steve Finley's contract expires after next season; Matt Kata, a switch-hitter, is emerging as a legitimate alternative at second, and a more highly regarded prospect, Scott Hairston, should be ready by '05. ..