I really can't choose between them, but I&W, SFAM and DT are my top 3 together. My favorite changes every few months.
I do know my preference of the rest, though:
4. ADTOE
5. Octavarium
6. Awake
7. SDOIT
8. FII Demos (I pretend the real album doesn't exist usually)
9. WDAD(Re)U / When Dream and James Unite-type bootlegs
10. TOT
11. SC
12. BCSL