What I find the most interesting is the midfield battle.
Mascherano and Gattuso are similar types of player.
Alonso and Pirlo are similar types of player.
Gerrard and Kaka are (somewhat) similar types of player.

And they're all roughly equal in ability. (Before I get any whines about Kaka > Gerrard, come back when you stop believing in media hype, kthx. Form is temporary, class is permanent. Gerrard was better in '06, Kaka has been in '07. Regardless, they are both class players.)

Weirdly, my head says Liverpool, my heart says Milan. It should be the other way around, but it isn't.

I'm having more fun predicting the Liverpool line up than the actual score, though!

Definites: Reina, Finnan, Carragher, Agger, Riise, Gerrard, Mascherano, Kuyt.
That leaves three spots. Spot 1 will be contested by Arbeloa, Zenden and Kewell, and the other two will be for Sissoko, Alonso, Pennant and Crouch to contest. With Zenden and Kewell's fitness issues, I think Arbeloa will start at left-back, and Riise on the left of midfield. I think Rafa will either put Stevie in the middle with Mascha, and Pennant on the wing (and Crouch up front) or Stevie will go on the wing and Alonso will go in the middle. There is a chance of a 4-5-1 though. Part of me would love to see us go 4-5-1, stick Sissoko, Gerrard and Mascherano in the middle and watch the fireworks.