Rewriting the end to Mass Effect 3

Wanted to try writing for a viddya game, so figured I'd start with a challenge: write a satisfying end to the Mass Effect series. [b]Ground Rules[/b] [spoiler] I'm only going to rewrite the last mission, Priority: Earth. There's lots I would change in the series, but to keep things manageable I'm focusing just on this one part. DLC or multiplayer should not be required to obtain any of the endings. I'm assuming I have an unlimited budget for cutscenes, voice acting etc.[/spoiler] [b]Key Concepts[/b] Here's my philosophy for the rewrite. If you disagree with this, you'll hate the rewrite, so there's probably little point in reading further. (1) Player choice [spoiler] The point will be to have key decisions in the series directly impact the ending (not indirectly via EMS). Each ending should leave the galaxy in a fundamentally different situation.[/spoiler] (2) Squaddies [spoiler] Shep's relationships with his team mates is absolutely central to ME. You're not fighting for the universe, you're fighting for them. So all (surviving) team members from previous games will be directly involved in the finale.[/spoiler] (3) Endings [spoiler] In addition to being unique, the possible endings should allow the player to reflect their play style, creating an ending that suits their particular Shepard. From most Paragon to most Renegade, the possible endings will be: Peace: Shepard does a Jean Luc Picard. With the Reapers in the ropes and his finger on the Crucible fire button, he opts to talk to them instead, convinces them to see they are wrong, and to protect the Galaxy rather than destroy it. Destruction A (Alliance): Shepard fires the Crucible and destroys the Reapers. An alliance of races establishes peace throughout the galaxy. Flight: Shepard realizes the Reapers can't be defeated, and chooses to flee in the hopes of helping future cycles overcome the Reapers. Self-sacrifice: The Reapers damage the Crucible. Normal firing is impossible. Shepard sends his team away, then sacrifices himself to activate it and destroy the Reapers. Mutual annihilation: The Reapers damage the Crucible. Normal firing is impossible. Shepard deliberately self-destructs the Crucible, destroying the galaxy's relay network, killing every major sentient race, but also wiping out the Reapers. Destruction B (Conquest): Shepard fires the Crucible and destroys the Reapers. Humanity becomes the dominant race. Control: Shepard sides with TIM/Cerberus, and helps them to take control of the Reapers. Cerberus uses them to enslave the galaxy.[/spoiler]