Is "Big 4" the same as "Top 4"? If so, then....
In no order:
1. Octavarium
2. Finally Free
3. Breaking All Illusions
4. Home
To me, "Big 4" has a bit of a different connotation than Top 4. So if they are indeed different things, then:
1. Octavarium
2. Finally Free
3. Breaking All Illusions
4. The Great Debate