Awesome, sounds like a lot of fun. I take it that you'll be using FCP that you decided on a mac?
I was referring to the ability to mix in surround sound formats. From my understanding with Pro Tools you either have to jump into the HD systems ($$$$) or purchase an upgrade for LE which if I remember right was something like $1500. Otherwise you're limited to 2 channel mixdowns. Pro Tools is cross platform and is the industry standard so those are 2 huge things it has going for it.
For music creation (I don't dabble too much with this stuff so I don't know a lot about it) it comes with several loops already built in as well as tons of instruments you can use with a MIDI interface. MIDI editing is super easy (drag and drop). I read
this article about Fallout Boy using Garage Band to compose his music. Garage Band is a really stripped down version of Logic. Comes free with the mac so if you are going that route you can always play around with GB and see if you like it before buying Logic. Also, if you're filmmakers are using FCP, you can import their FCP project directly into Logic and any changes you make, or they make, automatically update in the other program. Mostly I bought it because it was cheap with a student discount and it doesn't tie you to their expensive and I think limiting hardware. An 8 channel IO from Digidesign would set you back a lot compared to something from Pre-Sonus or other companies that PT would not support.
Here's apples breakdown. Pretty basic but a few Google searches would probably tell you what you want to know. Take a project to an Apple store and play with it.