My two choices:

"Sabotage" - Beastie Boys
A tribute to forged evidence and crime scene manipulation. Manfred von Karma sings lead, Taser in hand (for the most part; I may put some Godot/Kristoph love in there somewhere.) Includes the obligatory Klavier guitar solo.

"I'll Sue Ya" - Weird Al
Obvious. Gavel for rimshots. The part where he sings "I'll sue ya, I'll take all your money" etc. crescendoing will be played by Dahlia, simply because she has such a wide range of emotions (from sweet and nice, to angry, to evil, to ZOMG SHE'S AN EVIL GHOST RUN FOR YOUR LIVES!!!) Liberal use of evidence boxes, and, of course, a Klavier guitar intro.

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I've been waiting for a Phoenix Wright AMV of "Devil Went Down to Georgia" as the lyrics are set to the relatonships between Mia and Dahlia as well as Phoenix and Kristoph.

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how about Sense Fail- Buried a Lie?

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Of the two, I'd probably go with I'll Sue Ya. If I ever got around to making an AMV of my own, though, I'd probably use Ana Ng by They Might Be Giants.