Waah! Don’t convert in iTunes!!! I would never do such a thing.
I work with sound in the CORP and Film Worlds.
Get a list together of the sound KHZ and BIT differences, and let the PT guy/girl sort out any changes needed for you. (I think you have it already, your list) The music should be written in the same frame rate as the sound edit should of been.
Have the sound at 48K 24BIT – As someone else said already it’s better to go down than up. Going up will destroy some of the quality within the audio track. The OMF should be set at whatever rate you are in in your session. The final out-come for TV (and high end sound/visual system users) should (in my eyes) be the highest possible.