The Las Vegas Philharmonic is only eight years old. But the orchestra is growing, seems to have found an audience, and has a $1.5 million budget. So it’s time to pick a new music director. The candidates are: David Commanday of the Peoria Symphony Orchestra, David Itkin of the Arkansas Symphony Orchestra and Peter Rubardt of the Pensacola Symphony Orchestra. As part of the selection process, they will serve as guest conductors during the 2006-07 season.