I would look into an aux port or new head unit. Unless you don't mind using an external Ipod/Mp3 adapter for your phone or Ipod thru the radio. That's what I do with my 03 but I don't drive it every day, so it doesn't really matter that much.
If it's a daily or something that gets driven a lot it'd be worth upgrading to a new unit. The 6 disc changers are a pita to work on and most of the time you spend 6 hours trying to fix it and it still doesn't work...I speak from experience
12 Black GT500 SVT PP l VMP TVS l JLT123 l O/R X l 28x11.50Rx15 M/T Street R's l BMR Suspension l Recaros
03 Sonic Blue 3.8 / 17 Magnetic Fusion Sport 2.7 EB