The thing that will complicate it even more is that if the Angels trade him, it'll be because he won't sign a long term contract with us. Or he has 1 year left till free agency.
The amount you get will be dependent on when you trade him. Now will be the biggest bounty, but I don't know if there is any team willing to give up that much. 1 year left till free agency, and Angels fans won't be happy with what they get.
It's pretty much up to Mike Trout, because I can't think that the Angels won't try and sign him long term.