According to Marveluniverse.com the following are the complete Civil War issues including tie-ins. I have pretty much all of them except for She-Hulk and Illuminati.
Core Issues
Civil War #1-7,
Civil War: Front Line #1-11
Related/Tie-In Issues
Amazing Spider-Man #529-538,
New Avengers: Illuminati #1,
Fantastic Four #536-543,
Black Panther #18 & 23-25,
Blade #5,
Cable & Deadpool #30-32,
Captain America #22-25,
Civil War: Battle Damage Report,
Civil War: Choosing Sides,
Civil War: The Return #1,
Civil War: War Crimes #1,
Civil War: X-Men #1-4,
Civil War: Young Avengers & Runaways #1-4,
Civil War Files,
Daily Bugle: Civil War Edition,
Fantastic Four #538-543,
Ghost Rider #8-9,
Heroes For Hire #1-3,
Iron Man #13-14,
Iron Man/Captain America,
Moon Knight #7-9,
Ms. Marvel #6-8,
New Avengers #21-25,
Punisher War Journal #1-3,
She-Hulk #8,
Thunderbolts #103-105,
Winter Soldier: Winter Kills #1,
Wolverine #42-48,
X-Factor #8-9