Well, as you said it's hard to be concise, there are many songs left out but the "worst" on here is still a fantastic track, so very good selection.
I find it however a bit unbalanced, with the two ballads back to back, I'd space it out more, like
1. Metropolis Part 1
2. The Mirror
3. The Glass Prison
4. This Dying Soul
5. The Silent Man
6. 6:00
7. Breaking All Illusions
8. The Dance of Eternity
9. Trial of Tears
10. Learning to Live
11. Bridges in the Sky
12. Blind Faith
13. Fatal Tragedy
14. The Spirit Carries On
15. In the Presence of Enemies Part 1+2
16. Octavarium
17. A Change of Seasons