Applescript help in iTunes

Help

I have a friend who has asked me to take three large collections of mp3 and merge them. No so bad right? But he wants to keep the best copies, meaning sorting them based on bitrate, rating, etc.

I can dump them into itunes and have it show duplicates then hand sort them, but it seems that Automator or Applescript would be perfect for the job.

I am a novice Applescripter at best so I'm asking can anybody out there get me started with the basic script? I should be able to modify it based on the criteria he gives me.

Thanks for the help.